At the A1 level, 'complex' is a word you might hear when talking about buildings. Think of a 'shopping complex' or an 'apartment complex.' It just means a big place with many different parts or shops. You can also use it to say something is not easy. If a game has many rules, you can say it is 'complex.' It is the opposite of 'simple.' For example, 'The Lego set is complex.' This means it has many small pieces and takes a long time to build. Don't worry about the hard meanings yet; just think of it as 'many parts together' or 'not simple.'
For A2 learners, 'complex' starts to appear in more descriptions. You might use it to describe a problem in school or a machine. A computer is a 'complex machine' because it has many parts inside that work together. As a noun, you will see it in addresses, like 'I live in the Green Valley Complex.' This means a group of houses or apartments. It is important to know that 'complex' is more than just 'hard.' A long book might be 'complex' because it has many characters and stories, not just because the words are difficult. It is a good word to use when 'hard' feels too simple.
At the B1 level, you should understand 'complex' as both an adjective and a noun in common contexts. You can describe 'complex issues' like climate change or 'complex relationships' between friends. It means there are many connected parts that make it hard to explain quickly. You might also learn about 'complex sentences' in your English grammar lessons. These are sentences that use words like 'because,' 'although,' or 'which' to join ideas. In psychology, you might hear about an 'inferiority complex,' which is a feeling that you are not as good as others. This level is about seeing how the word describes things that are deep and have many layers.
B2 learners should use 'complex' to add nuance to their speaking and writing. Instead of saying a situation is 'complicated,' which can sound negative, use 'complex' to show that you recognize the different factors involved. You might discuss 'complex social structures' or 'complex industrial processes.' At this level, you should also be comfortable with the noun form in professional settings, such as a 'military-industrial complex' or a 'sports complex.' You should be able to distinguish between 'complex' (many parts) and 'complicated' (hard to deal with). It is a key word for academic discussions and formal reports where you need to show a deep understanding of a topic.
At the C1 level, 'complex' is used to describe highly sophisticated systems and abstract theories. You will encounter it in literature to describe 'complex character arcs' or 'complex themes.' In science, you might study 'complex systems theory,' which looks at how small changes can have big effects in systems like the weather or the stock market. You should be able to use the word with precision, perhaps using the adverb 'complexly' or related words like 'complexity.' At this level, 'complex' is not just a description; it is a way of thinking about the world as a web of interconnected influences where nothing is ever truly simple or isolated.
For C2 mastery, 'complex' is a fundamental concept used to navigate the highest levels of discourse. You understand the etymological roots in the Latin 'complexus' (interwoven) and how this informs its use in everything from 'complex analysis' in mathematics to 'complex adaptive systems' in biology. You can use the word to critique simplistic arguments, pointing out the 'complex interplay' of variables that others might miss. You are also aware of the word's history in psychoanalysis and its philosophical implications regarding the nature of reality. At this level, 'complex' is a tool for precision, used to acknowledge the inherent messiness and beauty of highly structured, multifaceted phenomena.

complex en 30 secondes

  • Complex means having many connected parts, making it not simple and often difficult to understand or explain without careful study.
  • As a noun, it refers to a group of buildings (like an apartment complex) or a psychological pattern of emotions (like an inferiority complex).
  • It is commonly used in science, math, architecture, and psychology to describe systems that are intricate and multifaceted.
  • The word is often confused with 'complicated,' but 'complex' is more neutral and focuses on the structure of the system.

The word complex is a multifaceted term that serves as both an adjective and a noun, carrying significant weight in various fields ranging from architecture to psychology and mathematics. At its core, the adjective form describes something that is not simple; it refers to a system or object composed of many interconnected parts that are woven together in a way that requires careful analysis to understand. Imagine a high-end mechanical watch: it is not just a clock, but a complex mechanism where hundreds of tiny gears must perfectly align to keep time. When people use this word, they are often signaling that a situation cannot be solved with a quick fix or a one-sentence explanation. It implies depth, nuance, and often a degree of difficulty. In professional settings, calling a project 'complex' warns stakeholders that it will require diverse expertise and significant time. In personal contexts, describing a person's character as 'complex' suggests they have many layers, perhaps some contradictory, which make them interesting but perhaps hard to fully know.

Technical Application
In science and mathematics, a complex system is one where the collective behavior of its parts entails properties that cannot be easily predicted from the individual components. For example, the human brain is the most complex structure known in the universe because of the trillions of neural connections that create consciousness.

The international trade agreement was so complex that it took a team of fifty lawyers three years to finalize the specific details of the tariffs.

As a noun, the word takes on a more physical or psychological meaning. In architecture and urban planning, a 'complex' is a group of buildings or units that are situated on the same site and are related in function. You might live in an apartment complex or work in a sports complex. Here, the word emphasizes the togetherness of the structures. In psychology, the term refers to a core pattern of emotions, memories, perceptions, and wishes in the personal unconscious organized around a common theme, such as the famous 'inferiority complex.' This usage suggests a knot of feelings that influences how a person acts, often without them realizing it. Understanding these different shades of meaning is crucial for using the word correctly in conversation.

Social Nuance
In social justice and sociology, 'complex' is often used to describe systemic issues like poverty or racism, indicating that these are not just individual choices but are woven into the very fabric of society's laws, history, and economy.

She moved into a new housing complex that featured a gym, a swimming pool, and a shared garden for all the residents.

Furthermore, the word is frequently used in the context of 'complex numbers' in mathematics, which involve both a real and an imaginary part. This specific academic use highlights the word's history of describing things that are 'braided' or 'folded' together. Whether you are discussing the complex plot of a mystery novel or the complex circuitry of a smartphone, you are always referring to a state of being where multiple elements exist in a delicate, often confusing, but structured relationship. It is a word that demands respect for the subject matter, as it acknowledges that there are no easy answers or simple views to be had.

The detective spent weeks trying to unravel the complex web of lies that the suspect had created to hide the truth.

Etymological Hint
The 'plex' part of the word comes from the Latin 'plectere,' meaning to weave or braid. Think of a complex situation as a braided rope with many different colored threads.

Modern climate models are incredibly complex, taking into account ocean currents, atmospheric pressure, and solar radiation.

In conclusion, 'complex' is a versatile and essential word for anyone looking to describe the intricacies of the modern world. It bridges the gap between the physical reality of a building complex and the abstract reality of a complex emotion. By using this word, you acknowledge the depth of a subject and invite others to look closer at the many parts that make up the whole. It is a word that values detail over generalization and accuracy over simplicity.

Using the word complex correctly requires an understanding of its grammatical roles and the contexts in which it thrives. As an adjective, it most commonly precedes the noun it modifies, such as in 'a complex problem' or 'a complex relationship.' However, it can also follow a linking verb like 'is,' 'seems,' or 'becomes.' For instance, 'The instructions for the new software are quite complex.' In this usage, it functions as a predicate adjective. It is important to note that 'complex' is often modified by adverbs of degree to specify just how intricate something is. You might hear phrases like 'extremely complex,' 'highly complex,' or 'unnecessarily complex.' These modifiers help the listener understand the level of effort required to grasp the subject.

Adjective Placement
When using it as an adjective, you can place it before the noun: 'He has a complex personality.' Or after a verb: 'The situation became complex when the police arrived.'

The scientist explained the complex chemical reaction using a simple diagram to help the students understand.

When using 'complex' as a noun, it usually requires an article ('a,' 'an,' or 'the') or a possessive pronoun ('my,' 'their'). For example, 'The industrial complex was located on the outskirts of the city.' In this sense, it acts like any other common noun and can be pluralized to 'complexes.' If you are talking about psychological complexes, you might say, 'He has a bit of a hero complex,' which means he feels a constant need to save others. This noun usage is very specific and usually refers to either a physical location or a mental state. Mixing these up can lead to confusion, so always ensure the surrounding words provide enough context to distinguish between a building and a feeling.

Common Noun Phrases
'Apartment complex,' 'military-industrial complex,' 'shopping complex,' and 'superiority complex' are all standard ways to use the noun form.

They are planning to build a massive sports complex in the center of the town to encourage more people to exercise.

In academic writing, 'complex' is often paired with abstract nouns to describe systems of thought or social structures. You might read about 'complex social hierarchies' or 'complex linguistic patterns.' In these cases, the word is used to justify why a simple explanation is insufficient. It invites the reader to look for nuances. For instance, 'The reasons for the economic recession were complex and varied.' This sentence prepares the reader for a long, detailed analysis. It is a very useful word for transitions, as it allows you to move from a general statement to a specific, detailed exploration of a topic.

The author’s writing style is notoriously complex, featuring long sentences and obscure vocabulary that challenge even the most avid readers.

Grammar Tip
The adverb form is 'complexly,' though it is quite rare. Most people prefer to say 'in a complex manner' or 'in a complex way.'

The legal system is so complex that most people cannot navigate it without the help of a professional lawyer.

Finally, consider the rhythm of your sentence. 'Complex' is a two-syllable word with a strong ending, making it punchy and authoritative. It works well at the end of a sentence for emphasis: 'The truth, as it turned out, was far more complex.' This structure creates a sense of mystery and depth, encouraging the audience to think more deeply about what has been said. Whether you are writing a formal report or having a casual conversation, mastering the placement and context of 'complex' will significantly enhance your expressive capabilities.

You will encounter the word complex in a surprising variety of everyday and specialized environments. In the world of real estate and urban living, it is perhaps most common. If you are looking for a new place to live, you might visit several 'apartment complexes.' In this context, the word is a neutral, descriptive noun. Similarly, in a business or industrial setting, you might hear about a 'manufacturing complex' or a 'corporate complex.' These terms describe a centralized hub where various related activities occur. When you hear 'complex' in these settings, think of a map with multiple buildings connected by paths or roads.

News and Media
Journalists often use 'complex' to describe political situations or international conflicts. You might hear a news anchor say, 'The situation in the Middle East remains deeply complex,' which is a way of saying there are many historical, religious, and political factors at play.

The CEO announced that the company would be moving its headquarters to a new office complex in Silicon Valley next year.

In the realm of psychology and self-help, 'complex' is a buzzword used to describe internal struggles. Phrases like 'inferiority complex' or 'God complex' have entered the common lexicon. If someone says, 'He has a real Napoleon complex,' they are using a psychological shorthand to suggest that a person is overcompensating for their short stature by being overly aggressive. In these cases, 'complex' refers to a knot of subconscious feelings. You will also hear it in medical contexts, such as 'complex regional pain syndrome' or 'complex carbohydrates.' In nutrition, 'complex carbohydrates' are those that take longer for the body to break down, providing more sustained energy than 'simple' sugars.

Academic and Scientific Discourse
In biology, researchers talk about 'complex organisms' to distinguish multi-cellular life from simple bacteria. In computer science, 'algorithmic complexity' refers to how much time or memory a program needs to run.

The wine critic described the vintage as having a complex aroma with hints of leather, dark chocolate, and dried cherries.

In the arts, 'complex' is a term of high praise. A 'complex character' in a movie or book is one who isn't just 'good' or 'bad' but has realistic motivations and flaws. Critics might praise a 'complex plot' that keeps the audience guessing with multiple subplots and twists. If you are watching a documentary about the universe, the narrator might describe the 'complex dance of the planets,' using the word to evoke a sense of wonder at the intricate laws of physics. In every one of these instances, the word 'complex' serves to elevate the subject, suggesting it is worthy of deep thought and careful attention.

The engineer noted that the complex wiring system of the aircraft required a specialized technician to repair it safely.

Pop Culture Reference
The term 'Military-Industrial Complex' is a famous phrase used to describe the relationship between a nation's military and the defense industry that supplies it, often heard in political debates.

The math teacher explained that complex numbers are essential for understanding alternating current in electrical engineering.

Whether you are at a construction site, a doctor's office, a movie theater, or a university lecture hall, 'complex' is a word that helps people categorize and communicate the intricate nature of the world around them. It is a bridge between the physical and the conceptual, providing a single term to describe anything that is made of many interconnected parts.

While complex is a very useful word, it is frequently misused in ways that can obscure your meaning. The most common mistake is using 'complex' as a simple synonym for 'difficult.' While many complex things are difficult, they are not the same thing. A task can be difficult but simple—for example, lifting a very heavy rock is difficult, but the process is simple. Conversely, something can be complex but not necessarily difficult once you understand the system—like a well-designed board game. When you use 'complex,' you should be emphasizing the number of parts or the intricate nature of the system, not just the level of effort required.

Complex vs. Complicated
These are often used interchangeably, but there is a subtle difference. 'Complicated' often has a negative connotation, suggesting something is unnecessarily hard to deal with or has too many confusing parts. 'Complex' is more neutral or even positive, suggesting a sophisticated structure. A 'complex' watch is a masterpiece; a 'complicated' watch might just be hard to read.

Incorrect: I have a complex time lifting this box. (Use 'difficult' or 'hard' instead). Correct: The complex machinery required two people to operate.

Another frequent error involves the confusion between the adjective 'complex' and the noun 'complexion.' 'Complexion' refers to the natural color, texture, and appearance of the skin on a person's face. While they share a root, they are never interchangeable. Saying 'She has a very complex face' means she has a face with many intricate features or a mysterious expression, whereas 'She has a clear complexion' means her skin is healthy and free of blemishes. Additionally, be careful with the plural form of the noun. While 'complexes' is the standard plural for buildings or psychological states, some people mistakenly try to use 'complex' as its own plural, which is grammatically incorrect.

Overuse in Business
In corporate environments, people often call things 'complex' to avoid giving a clear answer. If a boss asks why a report is late, saying 'it's complex' can sound like an excuse. It's better to explain *why* it is complex by mentioning the specific parts involved.

Incorrect: The complex of his skin was pale. (Use 'complexion'). Correct: He lived in a large apartment complex near the park.

There is also a common mistake in the pronunciation and stress of the word, especially when moving between the adjective and the noun. In American English, the adjective 'complex' often has the stress on the second syllable (com-PLEX), while the noun 'complex' (as in a building) often has the stress on the first syllable (COM-plex). However, this is not a strict rule and varies by region. The key is to be consistent within your own speech. Finally, avoid using 'complex' when a simpler word like 'many' or 'various' would suffice. Saying 'I have complex reasons for going' sounds a bit pretentious if you just mean 'I have several reasons for going.'

The complex nature of the problem meant that there was no single, easy solution that would satisfy everyone involved.

Spelling Note
Remember that 'complex' ends in an 'x'. Some learners mistakenly write 'complecks' or 'compleks' because of the sound, but the 'x' is essential to its Latin roots.

Trying to explain complex quantum physics to a five-year-old is a nearly impossible task for any teacher.

By being aware of these common pitfalls—confusing it with 'difficult,' 'complicated,' or 'complexion,' and misusing the stress or plural forms—you can use 'complex' with greater precision and confidence. It is a powerful word that, when used correctly, demonstrates a high level of linguistic sophistication and a deep understanding of the subject matter.

When you want to describe something that isn't simple, complex is a great choice, but it isn't the only one. Depending on the specific nuance you want to convey, other words might be more appropriate. For example, if you are describing something with many tiny, delicate parts, intricate is often a better choice. While 'complex' focuses on the interconnectedness of the system, 'intricate' focuses on the detail and craftsmanship. You would describe a complex computer program, but an intricate piece of jewelry. Understanding these subtle differences allows you to paint a more vivid picture for your audience.

Complex vs. Intricate
Use 'complex' for systems and logic (e.g., a complex argument). Use 'intricate' for physical details and patterns (e.g., an intricate lace pattern).

The complex ecosystem of the rainforest relies on thousands of species interacting in a delicate balance.

Another alternative is convoluted. This word has a distinctly negative connotation. It describes something that is complex in a way that is confusing, twisted, or unnecessarily difficult to follow. If a story has so many plot twists that you lose track of what's happening, you might call it 'convoluted.' On the other hand, sophisticated is a positive alternative. It suggests a high level of complexity that is the result of intelligence, culture, or advanced technology. A 'sophisticated' radar system is complex, but the word emphasizes its advanced nature and effectiveness rather than its difficulty.

Complex vs. Elaborate
'Elaborate' means something has been worked out with great care and detail. It often refers to plans or decorations. An 'elaborate' prank is one with many steps, while a 'complex' prank might involve high-tech gadgets.

The architect presented a complex blueprint for the new skyscraper, showing every floor and utility line.

In the context of the noun 'complex' (meaning a building), you might use facility, center, or compound. A 'research facility' is a more formal way to describe a group of labs. A 'shopping center' is a common alternative to a 'shopping complex.' A 'compound' usually implies a more enclosed or secured group of buildings, often used in military or high-security contexts. Choosing the right noun helps specify the purpose and atmosphere of the place you are describing. For psychological complexes, there aren't many direct synonyms, but you might use terms like fixation, obsession, or neurosis, though these carry different medical and social weights.

Her complex emotions about moving away were a mix of excitement for the future and sadness for what she was leaving behind.

Complex vs. Multifaceted
'Multifaceted' is a great word for describing people or problems that have many different 'faces' or aspects. It suggests variety and depth, similar to a diamond with many cut surfaces.

The complex history of the region is filled with stories of migration, war, and cultural exchange.

By expanding your vocabulary to include these synonyms and alternatives, you can be more precise in your descriptions. Whether you want to highlight the beauty of an 'intricate' design, the frustration of a 'convoluted' process, or the prestige of a 'sophisticated' system, having a range of words at your disposal will make your communication more effective and engaging. 'Complex' is a sturdy, reliable word, but sometimes the situation calls for a more specific tool.

How Formal Is It?

Formel

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Neutre

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Informel

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Child friendly

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Argot

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Le savais-tu ?

The 'plex' in complex is the same root found in 'googleplex,' which is a 1 followed by a googol of zeros!

Guide de prononciation

UK /ˈkɒm.pleks/
US /kəmˈpleks/
COM-plex (noun), com-PLEX (adjective)
Rime avec
Annex Convex Perplex Reflex Vertex Index Codex Duplex
Erreurs fréquentes
  • Pronouncing the 'x' as 'ks' too softly.
  • Stressing the wrong syllable in the noun form.
  • Confusing it with 'complexion'.
  • Using a 'k' instead of 'x' in spelling.
  • Mixing up the adjective and noun stress patterns.

Niveau de difficulté

Lecture 3/5

Easy to recognize in context but has multiple meanings.

Écriture 4/5

Requires care to use the noun and adjective forms correctly.

Expression orale 3/5

Commonly used, but stress patterns can be tricky.

Écoute 2/5

Usually clear from the surrounding words.

Quoi apprendre ensuite

Prérequis

Simple Hard Part Building Problem

Apprends ensuite

Complexity Complicated Intricate Sophisticated System

Avancé

Convoluted Multifaceted Interdependence Nuance Algorithm

Grammaire à connaître

Complex Sentences

Because it was raining, we stayed inside.

Adjective Order

A large, complex industrial building.

Predicate Adjectives

The situation is complex.

Noun Pluralization

There are three apartment complexes on this street.

Adverb Formation

The problem was complexly structured.

Exemples par niveau

1

The shopping complex is very big.

Le complexe commercial est très grand.

Noun usage: 'shopping complex'.

2

This puzzle is complex.

Ce puzzle est complexe.

Adjective usage: 'is complex'.

3

I live in an apartment complex.

J'habite dans un complexe d'appartements.

Noun usage with 'an'.

4

The game rules are complex.

Les règles du jeu sont complexes.

Adjective describing a plural noun.

5

A computer is a complex thing.

Un ordinateur est une chose complexe.

Adjective before the noun 'thing'.

6

The toy has a complex design.

Le jouet a un design complexe.

Adjective modifying 'design'.

7

Is the math homework complex?

Est-ce que les devoirs de maths sont complexes ?

Interrogative form.

8

The new school is a large complex.

La nouvelle école est un grand complexe.

Noun usage meaning a group of buildings.

1

The car engine is very complex.

Le moteur de la voiture est très complexe.

Adjective with the intensifier 'very'.

2

They built a new sports complex.

Ils ont construit un nouveau complexe sportif.

Noun phrase: 'sports complex'.

3

The story has a complex plot.

L'histoire a une intrigue complexe.

Adjective describing 'plot'.

4

The instructions are too complex for me.

Les instructions sont trop complexes pour moi.

Adjective with 'too'.

5

He works in an industrial complex.

Il travaille dans un complexe industriel.

Noun phrase: 'industrial complex'.

6

The human body is a complex system.

Le corps humain est un système complexe.

Adjective modifying 'system'.

7

This watch has a complex mechanism.

Cette montre a un mécanisme complexe.

Adjective modifying 'mechanism'.

8

The city has a complex road network.

La ville a un réseau routier complexe.

Adjective modifying 'road network'.

1

The relationship between the two countries is complex.

La relation entre les deux pays est complexe.

Adjective describing an abstract noun.

2

A complex sentence has a dependent clause.

Une phrase complexe a une proposition subordonnée.

Grammatical term: 'complex sentence'.

3

She has an inferiority complex about her height.

Elle a un complexe d'infériorité concernant sa taille.

Psychological noun: 'inferiority complex'.

4

The problem is more complex than it looks.

Le problème est plus complexe qu'il n'y paraît.

Comparative form: 'more complex than'.

5

We need to solve this complex issue together.

Nous devons résoudre ce problème complexe ensemble.

Adjective modifying 'issue'.

6

The software uses a complex algorithm.

Le logiciel utilise un algorithme complexe.

Adjective modifying 'algorithm'.

7

Living in a large city can be complex.

Vivre dans une grande ville peut être complexe.

Adjective as a subject complement.

8

The museum is part of a cultural complex.

Le musée fait partie d'un complexe culturel.

Noun phrase: 'cultural complex'.

1

The tax laws in this country are incredibly complex.

Les lois fiscales de ce pays sont incroyablement complexes.

Adjective with adverb 'incredibly'.

2

He has a complex personality that is hard to read.

Il a une personnalité complexe qui est difficile à cerner.

Adjective modifying 'personality'.

3

The company operates a complex supply chain.

L'entreprise exploite une chaîne d'approvisionnement complexe.

Business term: 'complex supply chain'.

4

The film explores complex themes of love and loss.

Le film explore des thèmes complexes d'amour et de perte.

Adjective modifying 'themes'.

5

The military-industrial complex influences policy.

Le complexe militaro-industriel influence la politique.

Political term: 'military-industrial complex'.

6

The surgery was complex and lasted eight hours.

L'opération était complexe et a duré huit heures.

Adjective describing a medical procedure.

7

Scientists are studying the complex behavior of ants.

Les scientifiques étudient le comportement complexe des fourmis.

Adjective modifying 'behavior'.

8

The architect designed a complex of glass towers.

L'architecte a conçu un complexe de tours de verre.

Noun usage: 'a complex of [things]'.

1

The novel's structure is complex, using multiple timelines.

La structure du roman est complexe, utilisant plusieurs chronologies.

Adjective describing literary structure.

2

The socio-economic factors are too complex for a simple fix.

Les facteurs socio-économiques sont trop complexes pour une solution simple.

Adjective describing abstract factors.

3

She analyzed the complex interplay between genes and environment.

Elle a analysé l'interaction complexe entre les gènes et l'environnement.

Phrase: 'complex interplay'.

4

The legal arguments became increasingly complex as the trial went on.

Les arguments juridiques sont devenus de plus en plus complexes au fil du procès.

Adjective with 'increasingly'.

5

The brain's neural network is the most complex system we know.

Le réseau neuronal du cerveau est le système le plus complexe que nous connaissions.

Superlative: 'the most complex'.

6

The diplomat navigated the complex political landscape with ease.

Le diplomate a navigué dans le paysage politique complexe avec aisance.

Metaphorical usage: 'political landscape'.

7

The music features complex rhythms and unusual scales.

La musique présente des rythmes complexes et des gammes inhabituelles.

Adjective modifying 'rhythms'.

8

He suffered from a complex set of symptoms that baffled doctors.

Il souffrait d'un ensemble complexe de symptômes qui déconcertait les médecins.

Phrase: 'complex set of symptoms'.

1

The philosopher delved into the complex nature of consciousness.

Le philosophe a approfondi la nature complexe de la conscience.

Adjective in philosophical discourse.

2

The treaty was criticized for its complex and ambiguous language.

Le traité a été critiqué pour son langage complexe et ambigu.

Adjective paired with 'ambiguous'.

3

Climate change is a complex adaptive system with many feedback loops.

Le changement climatique est un système adaptatif complexe avec de nombreuses boucles de rétroaction.

Scientific term: 'complex adaptive system'.

4

The artist's work is a complex meditation on identity and memory.

L'œuvre de l'artiste est une méditation complexe sur l'identité et la mémoire.

Metaphorical usage: 'complex meditation'.

5

The financial crisis was triggered by complex derivatives and lack of oversight.

La crise financière a été déclenchée par des produits dérivés complexes et un manque de surveillance.

Financial term: 'complex derivatives'.

6

The poem's meaning is complex and open to various interpretations.

Le sens du poème est complexe et ouvert à diverses interprétations.

Adjective describing semantic depth.

7

The software architecture is complexly layered to ensure security.

L'architecture du logiciel est structurée de manière complexe pour assurer la sécurité.

Adverbial usage: 'complexly layered'.

8

The study reveals the complex ways in which language shapes thought.

L'étude révèle les manières complexes dont le langage façonne la pensée.

Adjective modifying 'ways'.

Collocations courantes

complex problem
apartment complex
complex system
complex relationship
complex issue
complex task
complex numbers
complex carbohydrate
industrial complex
complex structure

Phrases Courantes

It's complex.

— Used to say that a situation is not easy to explain or solve.

I can't tell you why we broke up; it's complex.

Inferiority complex

— A feeling that you are not as good as other people.

He has an inferiority complex about his education.

Superiority complex

— An attitude that you are better than everyone else.

Her superiority complex makes her hard to work with.

Military-industrial complex

— The relationship between a country's military and the defense industry.

Eisenhower warned about the military-industrial complex.

Shopping complex

— A large building or group of buildings with many shops.

Let's meet at the shopping complex at noon.

Complex sentence

— A sentence with one independent and at least one dependent clause.

You should use more complex sentences in your essay.

God complex

— An arrogant belief that one has great power or is always right.

The surgeon was accused of having a God complex.

Complex needs

— Used to describe people who need help with many different things.

The charity helps children with complex needs.

Complex flavor

— A taste that has many different layers or notes.

This coffee has a very complex flavor profile.

Complex web

— A metaphorical way to describe a very complicated situation.

The spy was caught in a complex web of lies.

Souvent confondu avec

complex vs Complicated

Complicated often means difficult and annoying; complex just means having many parts.

complex vs Complexion

Complexion refers to skin color and texture, not difficulty or structures.

complex vs Perplex

Perplex is a verb meaning to confuse; complex is an adjective or noun.

Expressions idiomatiques

"Unravel a complex web"

— To solve or explain a very complicated situation or set of lies.

The detective finally unraveled the complex web of the crime.

Literary
"A complex of factors"

— A group of many different things that all contribute to a result.

A complex of factors led to the company's success.

Formal
"Deeply complex"

— Emphasizes that something has many layers and is very hard to understand.

The history of the region is deeply complex.

Neutral
"Complex-ridden"

— Describes someone who has many psychological complexes or insecurities.

The character in the play is complex-ridden and unhappy.

Literary
"Navigate a complex"

— To successfully deal with a difficult system or set of rules.

It is hard to navigate the complex legal system.

Neutral
"Complex-free"

— Describes something that is simple and without complications.

I want a complex-free life in the countryside.

Informal
"The complex truth"

— Suggests that the truth is not simple and has many sides.

The complex truth is that both sides were at fault.

Neutral
"A complex affair"

— Describes an event or situation that is very involved and difficult.

Organizing the wedding was a complex affair.

Neutral
"Complex by nature"

— Suggests that something is naturally difficult and cannot be simplified.

Human emotions are complex by nature.

Formal
"In all its complexity"

— To consider every part and detail of a difficult subject.

We must study the issue in all its complexity.

Formal

Facile à confondre

complex vs Complicated

They both mean 'not simple.'

Complex is about structure (many parts); complicated is about difficulty (hard to do).

A watch is complex; a bad relationship is complicated.

complex vs Intricate

They both describe detail.

Intricate is usually for small, physical details; complex is for systems and logic.

The lace is intricate; the computer code is complex.

complex vs Elaborate

They both mean 'detailed.'

Elaborate means something was made with great care; complex means it has many parts.

An elaborate dinner; a complex ecosystem.

complex vs Sophisticated

They both mean 'advanced.'

Sophisticated implies high quality or intelligence; complex just means many parts.

A sophisticated wine; a complex machine.

complex vs Convoluted

They both mean 'twisted.'

Convoluted is always negative and means 'too hard to follow.'; complex is neutral.

A convoluted excuse; a complex math problem.

Structures de phrases

A1

The [noun] is complex.

The game is complex.

A2

It is a complex [noun].

It is a complex machine.

B1

The [noun] is more complex than [noun].

The problem is more complex than the last one.

B1

I live in a [noun] complex.

I live in a shopping complex.

B2

Due to the complex nature of [noun]...

Due to the complex nature of the law...

C1

There is a complex interplay between [noun] and [noun].

There is a complex interplay between supply and demand.

C1

The [noun] is complexly [verb-ed].

The system is complexly designed.

C2

To understand [noun] in all its complexity...

To understand the brain in all its complexity...

Famille de mots

Noms

Verbes

Adjectifs

Apparenté

Comment l'utiliser

frequency

Very common in academic, professional, and technical English.

Erreurs courantes
  • I have a complex time. I am having a difficult time.

    Complex describes the structure of a thing, not the experience of time.

  • She has a nice complex. She has a nice complexion.

    Complexion is for skin; complex is for buildings or problems.

  • The math is very complicated. The math is very complex.

    In math, 'complex' is the technical term for certain types of numbers.

  • There are many complex on this street. There are many complexes on this street.

    The plural of the noun complex is complexes.

  • It's a complexly problem. It's a complex problem.

    Use the adjective 'complex' to modify the noun 'problem,' not the adverb.

Astuces

Choose the right word

Use 'complex' for systems and 'intricate' for physical details.

Noun vs Adjective

Remember that 'a complex' is a place, but 'is complex' is a description.

Mental Complexes

A 'complex' in psychology is a group of feelings that affect how you act.

Math Terms

In math, 'complex' has a very specific meaning involving imaginary numbers.

Academic Tone

Using 'complex' instead of 'hard' makes your writing sound more academic.

Stress Patterns

Pay attention to where you put the stress; it can change the feel of the word.

Word Family

Learn 'complexity' (noun) and 'complexly' (adverb) to expand your range.

Global Issues

Use 'complex' to describe big world problems like climate change.

Buildings

An 'industrial complex' is a great term for a large factory area.

Nutrition

'Complex carbohydrates' are the healthy ones found in whole grains!

Mémorise-le

Moyen mnémotechnique

Think of a 'Complex' as a 'Complicated Lexicon' (dictionary)—it has many parts and is hard to read!

Association visuelle

Imagine a giant braid made of many different colored threads. Each thread is a part of the complex whole.

Word Web

Intricate System Building Psychology Math Difficult Layers Interwoven

Défi

Try to write a sentence using 'complex' as both a noun and an adjective. Example: 'The apartment complex had a complex security system.'

Origine du mot

From the Latin 'complexus,' which is the past participle of 'complecti.'

Sens originel : To encircle, embrace, or comprise; literally 'to braid together.'

Indo-European (Latin branch)

Contexte culturel

Be careful when using 'complex' to describe people's mental health; it can sound clinical or dismissive.

Commonly used in both academic and casual settings to describe difficulty or structures.

The Military-Industrial Complex (Eisenhower) The Oedipus Complex (Freud) Complex Magazine (Pop culture)

Pratique dans la vie réelle

Contextes réels

Architecture

  • Apartment complex
  • Office complex
  • Building complex
  • Design complex

Psychology

  • Inferiority complex
  • Superiority complex
  • Mother complex
  • Psychological complex

Mathematics

  • Complex numbers
  • Complex plane
  • Complex analysis
  • Complex variables

Business

  • Complex problem
  • Complex strategy
  • Complex negotiation
  • Industrial complex

Science

  • Complex system
  • Complex organism
  • Complex molecule
  • Complex reaction

Amorces de conversation

"Do you think the world is becoming more complex or simpler?"

"Have you ever lived in a large apartment complex?"

"What is the most complex thing you have ever had to build?"

"Do you prefer simple stories or ones with a complex plot?"

"How do you handle complex problems at your work or school?"

Sujets d'écriture

Describe a complex relationship in your life and what makes it that way.

Write about a time you had to solve a complex problem and how you did it.

What are the pros and cons of living in a large housing complex?

Reflect on a complex book or movie that changed the way you think.

How does technology make our lives more complex? Is this a good thing?

Questions fréquentes

10 questions

It is usually neutral. It describes the structure of something. However, in some contexts, it can be positive (sophisticated) or slightly negative (difficult).

It is a group of buildings that contain many individual apartments, usually managed by the same company.

It is a psychological term for a person who constantly feels that they are not as good as others.

Yes, you can say someone has a 'complex personality,' meaning they have many different and sometimes contradictory traits.

The plural is 'complexes.' You add '-es' to the end of the word.

In math, they are numbers that have a real part and an imaginary part (like 3 + 2i).

Not exactly. Something can be complex (many parts) but easy to use, or hard (difficult) but very simple.

It refers to the close relationship between a nation's government, its armed forces, and the businesses that make weapons.

It is a sentence that has one main idea (independent clause) and at least one extra idea (dependent clause) joined by words like 'because' or 'if'.

As a noun (building), stress the first part: COM-plex. As an adjective (difficult), you can stress the second part: com-PLEX.

Teste-toi 180 questions

writing

Write a sentence using 'complex' as a noun to describe a place.

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writing

Write a sentence using 'complex' as an adjective to describe a problem.

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writing

Describe a 'complex relationship' in 2-3 sentences.

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writing

Explain the difference between 'complex' and 'simple' using an example.

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writing

Use 'complex' and 'complexity' in the same paragraph.

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writing

Write a sentence about a 'complex character' in a movie.

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writing

Explain what an 'apartment complex' is to a child.

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writing

Write a formal sentence using 'complex' for a business report.

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writing

Describe a 'complex flavor' of a food you like.

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writing

Use the phrase 'military-industrial complex' in a sentence.

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writing

Write a sentence using 'complex' to describe a machine.

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writing

Explain why 'complex' is different from 'difficult'.

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writing

Write a sentence about 'complex carbohydrates'.

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writing

Use 'complex' to describe a city's transport system.

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writing

Write a sentence about a 'complex plot' in a book.

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writing

Describe a 'complex situation' at work or school.

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writing

Write a sentence using 'complexly'.

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writing

Explain 'inferiority complex' in your own words.

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writing

Write a sentence about 'complex numbers' in math.

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writing

Use 'complex' to describe a piece of music.

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speaking

Pronounce 'complex' as a noun (building).

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speaking

Pronounce 'complex' as an adjective (difficult).

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speaking

Use 'complex' in a sentence about your favorite game.

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speaking

Explain what a 'shopping complex' is to a friend.

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speaking

Tell a short story about a 'complex problem' you solved.

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speaking

Describe a 'complex person' you know.

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speaking

Use 'complex' in a sentence about a city you visited.

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speaking

Explain the 'inferiority complex' to someone.

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speaking

Say 'The situation is deeply complex' with emphasis.

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speaking

Use 'complex' to describe a movie plot.

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speaking

Describe an 'apartment complex' you have seen.

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speaking

Use 'complex' in a sentence about science.

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speaking

Explain why math can be 'complex'.

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speaking

Use 'complex' to describe a piece of art.

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speaking

Talk about a 'complex issue' in the news.

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speaking

Use 'complex' in a sentence about food.

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speaking

Explain 'complex sentences' to a student.

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speaking

Use 'complex' to describe a machine.

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speaking

Say 'It's complex' in a way that sounds like you are thinking.

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speaking

Use 'complex' in a sentence about history.

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listening

Listen for the word 'complex' in this sentence: 'The shopping complex is open until ten.' Is it a noun or adjective?

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listening

In the phrase 'a complex problem,' where is the stress likely to be?

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listening

If a speaker says 'It's a complex of issues,' what do they mean?

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listening

Listen for 'complex' in a news clip about an 'industrial complex.' What is being described?

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listening

Does the speaker sound positive or negative when they say 'That's a convoluted, complex mess!'?

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listening

If someone says 'I have a complex about it,' what are they talking about?

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listening

In a cooking show, a chef mentions a 'complex sauce.' What does that mean?

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listening

Listen to: 'The brain's complexity is unmatched.' What is the noun used?

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listening

A teacher says 'Write a complex sentence.' What should the student do?

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listening

In a math lecture, the professor says 'complex plane.' What is he talking about?

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listening

Does 'complex' sound like 'com-plex' or 'com-pleks'?

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listening

If a realtor says 'This complex has great amenities,' what is she selling?

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listening

A doctor says 'It's a complex fracture.' Is the bone broken in one place or many?

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listening

Listen for 'complex' in a talk about 'complex organisms.' What is the example?

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listening

What is the opposite word heard in the sentence: 'It's not simple; it's complex.'?

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/ 180 correct

Perfect score!

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