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A2 adjective #5,800 最常用 15分钟阅读

instável

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开始练习 例句 笔记与提示

instável 30秒了解

  • Describes things that are not steady or firm.
  • Prone to change, collapse, or unpredictability.
  • Used for physical objects, conditions, or abstract situations.
  • Opposite of 'estável' (stable).
The Portuguese word "instável" is an adjective that describes something that is not stable, prone to change, or likely to collapse. It suggests a lack of firmness, steadiness, or predictability. You'll hear "instável" used in a wide variety of situations, from describing physical objects and conditions to abstract concepts and even people's moods or situations. Think of anything that might wobble, break, shift, or unpredictably alter its state; if it does, it can be described as "instável."
Physical Instability
This is perhaps the most common usage. Imagine a wobbly table, a rickety bridge, or a pile of rocks that looks like it could tumble down at any moment. These are all physically instável. In construction, a structure that is not sound and could fall is described as instável. Even the ground can be instável, especially in areas prone to earthquakes or landslides.
Unpredictable Conditions
"Instável" is also used for conditions that are unpredictable or subject to rapid change. For example, the weather can be instável, meaning it can change quickly from sunny to rainy or windy. The stock market can be instável, with prices fluctuating wildly. A patient's health condition might be described as instável if it is not improving or is worsening unpredictably.
Emotional or Mental State
People's emotions or mental states can also be described as instável. Someone who is moody, easily agitated, or whose feelings change rapidly might be considered instável. This can also apply to situations that are uncertain and stressful, leading to emotional instability.
Abstract Concepts
In a more abstract sense, "instável" can refer to things that lack a firm foundation or are subject to frequent alteration. A political situation might be instável if there is frequent unrest or changes in government. An economy that is not growing steadily or is facing many challenges could be described as instável. Even a relationship can be instável if there are frequent arguments or uncertainties.

A ponte antiga parecia instável.

O clima na montanha é muito instável.

Ele tem um humor instável.

A situação política no país é instável.

O mercado financeiro está instável hoje.

Using "instável" correctly in Portuguese sentences involves understanding its core meaning of lacking stability and applying it to various contexts. Here's a breakdown of how to construct sentences with "instável," focusing on different grammatical structures and common scenarios.

Basic Sentence Structure

The most straightforward way to use "instável" is to place it after the noun it modifies, agreeing in gender and number.
Masculine Singular
The noun is masculine and singular. For example, "o chão" (the ground). The adjective remains "instável." Example: "O chão sob os nossos pés estava instável." (The ground beneath our feet was unstable.)
Feminine Singular
The noun is feminine and singular. For example, "a situação" (the situation). The adjective remains "instável." Example: "A situação política do país tornou-se instável." (The country's political situation became unstable.)
Masculine Plural
The noun is masculine and plural. For example, "os resultados" (the results). The adjective remains "instável." Example: "Os resultados financeiros foram instáveis durante o ano." (The financial results were unstable throughout the year.)
Feminine Plural
The noun is feminine and plural. For example, "as condições" (the conditions). The adjective remains "instável." Example: "As condições climáticas são instáveis nesta região." (The climatic conditions are unstable in this region.)

Using "Ser" and "Estar"

The verbs "ser" (to be, permanent) and "estar" (to be, temporary) are crucial when using "instável."
With 'Ser' (More Permanent Characteristic)
"Ser" is used when describing an inherent or more permanent characteristic of instability. This might apply to something that is fundamentally prone to being unstable. Example: "Este tipo de solo é instável para construir." (This type of soil is unstable for building.) Here, the soil's nature makes it inherently unstable for construction. Example: "Sua personalidade instável o tornava difícil de prever." (His unstable personality made him difficult to predict.) This suggests a fundamental trait of the person.
With 'Estar' (Temporary or Current State)
"Estar" is used for temporary states or conditions of instability. Example: "O preço das ações está instável hoje." (The stock price is unstable today.) This refers to the current, fluctuating state of the market. Example: "O paciente está instável após a cirurgia." (The patient is unstable after surgery.) This describes the patient's current, precarious health condition. Example: "O tempo está instável, com chuvas e sol alternando." (The weather is unstable, with rain and sun alternating.) This refers to the current, unpredictable weather pattern.

Adverbial Phrases

You can modify "instável" with adverbs to add more detail.
Adding Intensity
Adverbs like "muito" (very), "extremamente" (extremely), or "bastante" (quite) can be used. Example: "A estrutura da ponte é muito instável." (The bridge's structure is very unstable.) Example: "O mercado está extremamente instável ultimamente." (The market has been extremely unstable lately.)

Using "Instável" in More Complex Sentences

"Instável" can also be part of subordinate clauses or used to describe the consequence of something.
Describing Consequences
Example: "A falta de fundos tornou o projeto instável e sujeito a cancelamento." (The lack of funds made the project unstable and subject to cancellation.)
In Relative Clauses
Example: "Precisamos de um plano de contingência para lidar com a economia instável." (We need a contingency plan to deal with the unstable economy.)

O solo instável dificultou a construção.

A maré instável representava um perigo para os barcos.

Seu humor instável era imprevisível.

O mercado de ações está instável neste momento.

A ligação de internet estava instável durante a reunião.

"Instável" is a word you'll encounter frequently in everyday Portuguese, across various media and conversations. Its versatility means it pops up in contexts ranging from casual chats to formal reports.

News and Current Events

Journalists and news anchors often use "instável" to describe fluctuating or precarious situations. You'll hear it in reports about:
  • Economia: "O mercado financeiro global está instável devido às tensões geopolíticas." (The global financial market is unstable due to geopolitical tensions.)
  • Política: "A situação política no país vizinho permanece instável após as eleições." (The political situation in the neighboring country remains unstable after the elections.)
  • Clima: "Previsão de tempo instável para o fim de semana, com possibilidade de tempestades." (Unstable weather forecast for the weekend, with the possibility of storms.)
  • Saúde Pública: "O número de casos continua instável, exigindo cautela." (The number of cases remains unstable, requiring caution.)

Everyday Conversations

In casual settings, "instável" is used to describe things that are not reliable or are prone to change.
  • Physical Objects: "Cuidado com essa cadeira, ela parece instável." (Be careful with that chair, it seems unstable.)
  • Personal Situations: "Ele está passando por um momento instável na carreira." (He is going through an unstable period in his career.)
  • Emotions: "O humor dela é um pouco instável ultimamente." (Her mood is a bit unstable lately.)
  • Technology: "Minha conexão com a internet está instável hoje." (My internet connection is unstable today.)

Technical and Scientific Contexts

In more specialized fields, "instável" carries precise meanings.
  • Engineering/Construction: "O solo instável exigiu fundações especiais para o edifício." (The unstable soil required special foundations for the building.)
  • Chemistry: "Alguns isótopos são instáveis e decaem com o tempo." (Some isotopes are unstable and decay over time.)
  • Medicine: "O estado do paciente é instável, mas esperançoso." (The patient's condition is unstable, but hopeful.)

Literature and Media

Authors and scriptwriters use "instável" to add depth and realism to characters and plots.
  • Describing a character's psychological state: "Sua mente instável o levava a tomar decisões impulsivas." (His unstable mind led him to make impulsive decisions.)
  • Setting a scene: "A atmosfera na sala era tensa e instável." (The atmosphere in the room was tense and unstable.)

O repórter disse que a situação era instável.

Eu disse a ele que a mesa estava instável.

A atriz interpretou um personagem com uma vida instável.

O engenheiro alertou sobre o terreno instável.

O clima instável mudou rapidamente.

When learning Portuguese, learners might make certain mistakes when using the word "instável." These often stem from confusion with similar concepts, incorrect verb usage, or misapplication of the adjective.

1. Confusing "Ser" and "Estar"

This is a very common pitfall for Portuguese learners.
Mistake
Using "ser instável" when "estar instável" is more appropriate, or vice versa.
Example of Mistake
"O tempo é instável hoje." (Incorrect for a temporary state of weather.)
Correction
"O tempo está instável hoje." (Correct, as weather is usually a temporary condition.)
Explanation
"Ser" implies a more permanent or inherent characteristic of instability, while "estar" refers to a current, temporary state. If you're talking about the weather today, it's "estar." If you're describing a type of terrain that is fundamentally unstable, you might use "ser." For example, "Este tipo de solo é instável para construção" (This type of soil is inherently unstable for construction) uses "ser."

2. Incorrect Agreement

While "instável" itself doesn't change form for gender, it's important to ensure the noun it modifies is correctly identified.
Mistake
Thinking "instável" changes for gender like many other adjectives.
Example of Mistake
"A situação é instávele." (Incorrect. "Instável" does not change for gender.)
Correction
"A situação é instável." (Correct.)
Explanation
Adjectives ending in "-vel" or "-l" often have the same form for masculine and feminine singular. "Instável" is one of these. The plural form is "instáveis." So, "o chão instável" (the unstable ground) and "a ponte instável" (the unstable bridge) both use "instável." The plural would be "os chãos instáveis" or "as pontes instáveis."

3. Overusing "Instável"

Sometimes learners might use "instável" when a more specific or nuanced word would be better.
Mistake
Using "instável" for situations that are simply "difficult" or "uncertain" without the core meaning of lacking stability.
Example of Mistake
"A reunião foi instável." (This might be understood, but it's vague.)
Correction
"A reunião foi tensa." (The meeting was tense.) or "A reunião foi incerta." (The meeting was uncertain.)
Explanation
While "instável" can sometimes imply uncertainty, its primary meaning is about a lack of physical or conceptual stability. If a meeting was "instável," it might imply that the chairs were wobbly, or perhaps the discussion was constantly shifting without resolution. If the meeting was simply difficult or uncertain, other words like "difícil," "tenso," or "incerto" might be more precise. Always consider if the core idea of lacking stability is present.

4. Misinterpreting Related Words

Confusing "instável" with words that sound similar or have overlapping meanings can lead to errors.
Mistake
Using "instável" for something that is merely "inconsistent" or "variable" without the connotation of potential collapse or severe fluctuation.
Example of Mistake
"O desempenho dele é instável." (Could be understood, but "variável" or "inconsistente" might be better.)
Correction
"O desempenho dele é variável." (His performance is variable.) or "O desempenho dele é inconsistente." (His performance is inconsistent.)
Explanation
While "instável" can sometimes encompass variability, it carries a stronger sense of precariousness or a potential for dramatic change or collapse. "Variável" simply means subject to variation, and "inconsistente" means lacking consistency. If the performance fluctuates wildly or seems about to fail, "instável" is appropriate. If it just goes up and down without a sense of danger, "variável" or "inconsistente" might be more precise.

Eu disse "estar instável" para o tempo.

A ponte é instável, não instávele.

A situação instável não é a mesma que uma situação difícil.

O mercado instável é diferente do mercado variável.

Lembre-se: "instável" não muda para feminino.

While "instável" is a precise word, Portuguese offers several other terms that can be used depending on the specific nuance you wish to convey. Understanding these alternatives will enrich your vocabulary and allow for more precise expression.

1. Instável vs. Volátil

Both "instável" and "volátil" describe things that change rapidly, but "volátil" often implies a more rapid, unpredictable, and sometimes dangerous fluctuation, especially in contexts like markets or chemicals.
Volátil
Often used for markets, prices, gases, or temperaments that change very quickly and unpredictably. It suggests a more energetic and potentially explosive change.
Example
"O mercado de criptomoedas é altamente volátil." (The cryptocurrency market is highly volatile.) - This implies rapid and significant price swings.
Comparison
While a volatile market is certainly unstable, "volátil" emphasizes the speed and intensity of the changes more than "instável." You might say a bridge is "instável" because it's old and shaky, but you wouldn't typically call it "volátil" unless it was also prone to sudden, rapid movements.

2. Instável vs. Inconstante

"Inconstante" also means not stable or regular, but it usually refers to a lack of constancy in behavior, mood, or quality over time, often implying unreliability rather than a risk of collapse.
Inconstante
Describes something that changes frequently, lacks regularity, or is unreliable in its behavior or state. It's often used for people's moods, decisions, or performance.
Example
"Seu humor é inconstante, muda várias vezes ao dia." (His mood is inconstant, it changes several times a day.)
Comparison
"Instável" suggests a more precarious state, a risk of falling or breaking. "Inconstante" suggests frequent changes without necessarily implying danger or collapse. A person can have an "inconstante" performance (sometimes good, sometimes bad) without their job being "instável" (at risk of being lost). However, a person with an "inconstante" temper might be described as "instável" if their mood swings are extreme and unpredictable, potentially leading to volatile reactions.

3. Instável vs. Incerto

"Incerto" means uncertain, doubtful, or not known. It focuses on the lack of knowledge or predictability about the future, rather than the physical or structural precariousness implied by "instável."
Incerto
Used when the outcome, future, or nature of something is unknown or doubtful.
Example
"O futuro da empresa é incerto." (The future of the company is uncertain.)
Comparison
A situation can be both "instável" and "incerto." For example, a political situation might be "instável" (prone to sudden changes or collapse) and also "incerto" (its future outcome is unknown). However, something can be "incerto" without being "instável." For instance, the exact date of a future event might be "incerto," but the event itself isn't necessarily unstable. Conversely, a shaky old building is "instável" even if its future collapse date is precisely known.

4. Instável vs. Precário

"Precário" means precarious, unstable, or of poor quality. It often overlaps with "instável" but can emphasize the poor condition or lack of resources that leads to instability.
Precário
Suggests a state of insecurity, poor quality, or lack of support, often leading to instability. It can refer to physical conditions, living situations, or employment.
Example
"Ele vive em condições precárias." (He lives in precarious conditions.)
Comparison
A "situação precária" (precarious situation) is very likely "instável" (unstable). The difference is in emphasis. "Precário" highlights the poor quality or lack of security, while "instável" highlights the potential for collapse or significant change. For example, a flimsy tent might be described as "instável" due to its lack of structure, and also "precário" due to its poor quality materials.

5. Synonyms and Related Concepts

Other words that might be used in similar contexts, with slightly different meanings, include:
  • Frágil: Fragile, easily broken. (e.g., "um vidro frágil")
  • Desequilibrado: Unbalanced, out of balance. (e.g., "um sistema desequilibrado")
  • Tremoroso: Trembling, shaky. (e.g., "uma mão tremorosa")
  • Irregular: Irregular, not uniform. (e.g., "um padrão irregular")

O mercado volátil mudou rapidamente.

O humor inconstante dele era irritante.

O futuro incerto me preocupava.

As condições precárias pioraram.

A ponte instável estava em mau estado.

How Formal Is It?

趣味小知识

The concept of 'instability' is ancient and has been a subject of philosophical and scientific inquiry for millennia. From the ever-changing elements described by ancient Greek philosophers to modern physics' exploration of quantum uncertainty, the idea of things not being fixed has always been present.

发音指南

UK /ɪnˈsta.bəl/
US /ɪnˈsteɪ.bəl/
The stress falls on the second syllable: ins-TÁ-vel.
押韵词
ável possível notável aceitável amável visível audível tranquilo
常见错误
  • Misplacing stress on the first syllable.
  • Pronouncing the 'a' as a closed vowel sound.
  • Adding an extra syllable or sound at the end.

难度评级

阅读 2/5

The word itself is straightforward, but understanding its application with 'ser' vs. 'estar' and in various abstract contexts can be challenging for beginners.

写作 2/5
口语 2/5
听力 2/5

接下来学什么

前置知识

estável ser estar mudança firme

接下来学习

volátil inconstante precário incerto desequilíbrio

高级

fluidez precipício turbulência entropia contingência

需要掌握的语法

Agreement of Adjectives: Adjectives must agree in number with the noun they modify. 'Instável' becomes 'instáveis' in the plural.

As pontes são instáveis. (The bridges are unstable.)

Ser vs. Estar: 'Ser' is used for inherent or permanent characteristics, while 'estar' is used for temporary states or conditions.

Este solo é instável (inherently). O tempo está instável (today).

Adjective Placement: Adjectives usually follow the noun they modify, but can precede it for emphasis.

Uma situação instável. (A neutral order) / Uma instável situação. (For emphasis)

Use of Adverbs: Adverbs can modify adjectives to add intensity or nuance.

O mercado está muito instável.

Gender Agreement: Adjectives ending in -l, -r, -z, or -s often have the same form for masculine and feminine singular.

O homem instável. A mulher instável.

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按水平分级的例句

1

A cadeira está instável.

The chair is unstable.

Basic adjective placement after the noun.

2

O tempo está instável.

The weather is unstable.

Using 'estar' for temporary conditions.

3

O chão é instável.

The ground is unstable.

Using 'ser' for a characteristic of the ground.

4

A ponte é instável.

The bridge is unstable.

Basic adjective placement.

5

Ele está instável.

He is unstable.

Describing a person's state.

6

A situação instável.

The unstable situation.

Adjective modifying a noun.

7

Não suba, é instável.

Don't climb, it's unstable.

Using 'é' (ser) for a characteristic.

8

O copo está instável.

The glass is unstable.

Using 'estar' for a temporary state.

1

O solo instável dificultou a construção.

The unstable soil made construction difficult.

Using 'instável' as a subject complement.

2

O preço do petróleo está instável.

The price of oil is unstable.

Using 'estar' for market conditions.

3

A saúde dela está instável.

Her health is unstable.

Describing a medical condition.

4

O clima na montanha é muito instável.

The weather in the mountains is very unstable.

Using 'ser' for a characteristic of a location's weather, or 'estar' for current weather.

5

Tivemos uma conexão de internet instável.

We had an unstable internet connection.

Using 'ter' and 'instável' to describe a past experience.

6

Ele tem um temperamento instável.

He has an unstable temperament.

Using 'ter' to describe a characteristic.

7

A estrutura da casa parece instável.

The house's structure seems unstable.

Using 'parecer' with 'instável'.

8

A maré instável era perigosa para os barcos.

The unstable tide was dangerous for the boats.

Adjective describing a natural phenomenon.

1

A instabilidade política do país é um fator preocupante.

The country's political instability is a worrying factor.

Using the noun form 'instabilidade'.

2

Os mercados financeiros globais estão particularmente instáveis neste trimestre.

Global financial markets are particularly unstable this quarter.

Using adverbs to modify 'instável'.

3

O paciente encontra-se em estado instável após a cirurgia.

The patient is in an unstable condition after the surgery.

Formal phrasing for medical situations.

4

A economia do país tem sido marcada por um crescimento instável nas últimas décadas.

The country's economy has been marked by unstable growth in recent decades.

Describing trends over time.

5

Ele lutava para manter um emprego estável devido ao seu temperamento instável.

He struggled to maintain a stable job due to his unstable temperament.

Contrasting 'instável' with 'estável'.

6

As condições de vida na região são precárias e instáveis.

Living conditions in the region are precarious and unstable.

Using multiple adjectives.

7

A tecnologia de comunicação sem fio pode ser instável em áreas remotas.

Wireless communication technology can be unstable in remote areas.

Describing technological performance.

8

O artista explorou a natureza instável da realidade em suas obras.

The artist explored the unstable nature of reality in his works.

Abstract and philosophical usage.

1

A fragilidade da infraestrutura torna a região vulnerável a desastres naturais, especialmente em um cenário de clima instável.

The fragility of the infrastructure makes the region vulnerable to natural disasters, especially in a scenario of unstable climate.

Complex sentence structure with causal links.

2

A política monetária tem sido um fator de instabilidade para a moeda nacional, que apresenta flutuações instáveis no mercado internacional.

Monetary policy has been a factor of instability for the national currency, which shows unstable fluctuations in the international market.

Financial and economic vocabulary.

3

O comportamento errático e instável do líder gerou desconfiança entre os aliados.

The leader's erratic and unstable behavior generated distrust among allies.

Describing political or leadership behavior.

4

A internet em banda larga, embora rápida, pode apresentar uma conexão instável em horários de pico de uso.

Broadband internet, although fast, can present an unstable connection during peak usage hours.

Technical context with a concession.

5

Apesar de sua aparente solidez, a fundação da antiga construção era instável e representava um risco iminente.

Despite its apparent solidity, the foundation of the old construction was unstable and represented an imminent risk.

Describing a hidden danger.

6

A busca por estabilidade em um mundo cada vez mais instável é um dilema para muitos.

The search for stability in an increasingly unstable world is a dilemma for many.

Philosophical and societal commentary.

7

Os efeitos de longo prazo da exposição a substâncias instáveis ainda estão sendo estudados.

The long-term effects of exposure to unstable substances are still being studied.

Scientific research context.

8

A narrativa do filme é propositalmente instável, refletindo a mente perturbada do protagonista.

The film's narrative is intentionally unstable, reflecting the protagonist's disturbed mind.

Literary and cinematic analysis.

1

A arquitetura modernista frequentemente desafiava os cânones de estabilidade, empregando formas audaciosamente instáveis que manipulavam a percepção espacial.

Modernist architecture often challenged the canons of stability, employing audaciously unstable forms that manipulated spatial perception.

Advanced vocabulary and complex sentence structure.

2

A volatilidade dos mercados emergentes, embora apresente riscos, também pode ser vista como um reflexo de um sistema em transição, intrinsecamente instável.

The volatility of emerging markets, while presenting risks, can also be seen as a reflection of a system in transition, intrinsically unstable.

Economic analysis with nuanced vocabulary.

3

A psique humana, em sua essência, é um campo de forças em perpétuo movimento, por vezes manifestando-se como um estado de ser profundamente instável.

The human psyche, in its essence, is a field of forces in perpetual motion, sometimes manifesting as a profoundly unstable state of being.

Psychological and philosophical discourse.

4

A ecologia de recifes de coral é notoriamente sensível a alterações mínimas, tornando-a um ecossistema intrinsecamente instável diante das mudanças climáticas.

Coral reef ecology is notoriously sensitive to minimal changes, making it an intrinsically unstable ecosystem in the face of climate change.

Environmental science terminology.

5

O regime político, caracterizado por alianças efêmeras e constantes disputas internas, mantinha uma existência precária e instável.

The political regime, characterized by ephemeral alliances and constant internal disputes, maintained a precarious and unstable existence.

Political science terminology.

6

A busca por autenticidade em um mundo saturado de simulações pode levar a uma sensação existencial de ser instável, desprovido de um referencial fixo.

The search for authenticity in a world saturated with simulations can lead to an existential sense of being unstable, devoid of a fixed reference point.

Existential philosophy and critical theory.

7

A instabilidade inerente à condição humana, a constante oscilação entre a razão e a emoção, torna a jornada da vida imprevisível e por vezes instável.

The inherent instability of the human condition, the constant oscillation between reason and emotion, makes life's journey unpredictable and at times unstable.

Humanities and philosophical reflection.

8

A performance artística, ao subverter expectativas e desconstruir formas tradicionais, frequentemente abraça o efêmero e o instável como elementos centrais.

Artistic performance, by subverting expectations and deconstructing traditional forms, often embraces the ephemeral and the unstable as central elements.

Art theory and criticism.

1

A própria tessitura da realidade quântica, com sua natureza probabilística e observador-dependente, desafia as noções clássicas de estabilidade, apresentando um panorama intrinsecamente instável.

The very fabric of quantum reality, with its probabilistic and observer-dependent nature, challenges classical notions of stability, presenting an intrinsically unstable panorama.

Advanced physics and complex philosophical concepts.

2

A crítica pós-estruturalista desmantela as metanarrativas que outrora conferiam estabilidade ao discurso, revelando a instabilidade inerente a todas as formas de significação.

Post-structuralist criticism dismantles the meta-narratives that once conferred stability to discourse, revealing the inherent instability of all forms of signification.

Literary theory and philosophy of language.

3

A dinâmica social em períodos de transição radical frequentemente se manifesta através de uma instabilidade exacerbada, onde as estruturas de poder se tornam fluidas e instáveis.

Social dynamics in periods of radical transition often manifest through exacerbated instability, where power structures become fluid and unstable.

Sociology and political science.

4

A fragilidade da memória, sua plasticidade e suscetibilidade à reconstrução e ao esquecimento, aponta para uma base existencial frequentemente instável.

The fragility of memory, its plasticity and susceptibility to reconstruction and forgetting, points to a frequently unstable existential foundation.

Psychology and philosophy of mind.

5

A metáfora do caleidoscópio, com suas mudanças constantes e padrões emergentes de uma base instável, pode servir como um modelo para compreender a natureza da criatividade.

The kaleidoscope metaphor, with its constant changes and emergent patterns from an unstable base, can serve as a model for understanding the nature of creativity.

Metaphorical language and abstract reasoning.

6

O colapso de sistemas complexos, sejam eles ecológicos, econômicos ou informacionais, é frequentemente precedido por um período de instabilidade crescente e não linear.

The collapse of complex systems, whether ecological, economic, or informational, is often preceded by a period of growing, non-linear instability.

Systems theory and complex science.

7

A arte performática, ao se desvincular da permanência do objeto, abraça a efemeridade e a instabilidade como elementos constitutivos de sua linguagem.

Performance art, by detaching itself from the permanence of the object, embraces ephemerality and instability as constitutive elements of its language.

Art theory and aesthetics.

8

A própria noção de identidade, em face das influências pós-modernas, pode ser vista como um constructo em constante reconfiguração, por natureza instável.

The very notion of identity, in the face of postmodern influences, can be seen as a constantly reconfiguring construct, inherently unstable.

Postmodern philosophy and identity studies.

常见搭配

clima instável
mercado instável
situação instável
solo instável
humor instável
conexão instável
terreno instável
estado instável
crescimento instável
estrutura instável

常用短语

estar instável

— To be unstable. This is the most common way to use the adjective.

O preço da gasolina está instável.

ser instável

— To be inherently unstable. Used for characteristics.

Este tipo de rocha é instável.

tornar-se instável

— To become unstable. Indicates a change in state.

A situação política tornou-se instável.

deixar instável

— To make something unstable.

A chuva forte deixou o terreno instável.

muito instável

— Very unstable. Adds emphasis.

O mercado está muito instável hoje.

relativamente instável

— Relatively unstable. Lessens the intensity.

A conexão está relativamente instável.

perigosamente instável

— Dangerously unstable. Highlights the risk.

A montanha de lixo era perigosamente instável.

uma natureza instável

— An unstable nature. Refers to inherent characteristics.

Ele tem uma natureza instável.

um período instável

— An unstable period. Refers to a duration of time.

Estamos a viver um período instável.

deixar algo instável

— To leave something in an unstable state.

O terremoto deixou a cidade instável.

容易混淆的词

instável vs Inconstante

'Inconstante' implies frequent changes or lack of regularity, often used for moods or behavior, whereas 'instável' suggests a risk of collapse or significant disruption.

instável vs Volátil

'Volátil' implies very rapid and unpredictable changes, often with a sense of danger or explosive potential, especially in markets or chemistry. 'Instável' is broader and can refer to a slower, less dramatic lack of steadiness.

instável vs Precário

'Precário' emphasizes poor quality or insecurity leading to instability, while 'instável' focuses more on the lack of steadiness itself.

习语与表达

"andar sobre ovos"

— To walk on eggshells; to be very careful because a situation is sensitive or unstable.

Com o chefe de mau humor, todos andavam sobre ovos.

Informal
"estar por um fio"

— To be hanging by a thread; to be in a very precarious or unstable situation.

A sua recuperação está por um fio.

General
"ter os pés de barro"

— To have feet of clay; to have a fundamental weakness or instability that could lead to downfall.

A empresa parecia forte, mas tinha os pés de barro.

General
"na corda bamba"

— On a tightrope; in a precarious or unstable situation, often financially or professionally.

O seu emprego está na corda bamba.

General
"um castelo de cartas"

— A house of cards; something that is easily destroyed or collapses due to its unstable foundation.

O plano deles era um castelo de cartas.

General
"chão instável"

— Unstable ground (literal or figurative). Can refer to physical terrain or a precarious situation.

O terreno era instável, e a construção foi difícil.

General
"balançar precariamente"

— To sway precariously; to be in an unstable state, close to falling or collapsing.

O velho baloiço balançava precariamente.

General
"ter um alicerce instável"

— To have an unstable foundation; refers to something built on a weak or unreliable base.

A sua teoria tinha um alicerce instável.

General
"um barco à deriva"

— A boat adrift; someone or something without direction or control, in an unstable state.

Sentia-se como um barco à deriva.

General
"no olho do furacão"

— In the eye of the storm; in the midst of a chaotic or unstable situation.

Ele estava no olho do furacão político.

General

容易混淆

instável vs Inconstante

Both words describe a lack of regularity or steadiness.

'Instável' implies a risk of collapse or significant disruption, a lack of firm foundation. 'Inconstante' implies frequent changes without necessarily implying danger, more about lack of consistency over time. For example, a person's mood can be 'inconstante' (changing often), but if those changes are extreme and lead to unpredictable outbursts, they might be described as 'instável'.

O desempenho do jogador é inconstante (às vezes bom, às vezes mau), mas a sua carreira não é instável (não corre risco de acabar).

instável vs Volátil

Both relate to rapid change.

'Volátil' suggests very quick, often dramatic, and potentially explosive changes. It's common for gases, markets, or temperaments. 'Instável' is a broader term for anything lacking steadiness, which could include slower changes or a risk of falling. A bridge might be 'instável' because it's old, but a chemical reaction might be 'volátil' because it's highly reactive and changes rapidly.

O preço das ações está volátil (muda muito rápido e drasticamente), mas a estrutura da bolsa não é instável (ela não vai cair).

instável vs Precário

Both describe a lack of security or stability.

'Precário' emphasizes poor quality, lack of resources, or insecurity that results in instability. It often refers to living conditions, jobs, or health. 'Instável' focuses on the lack of steadiness itself. For example, 'condições precárias de moradia' (precarious living conditions) lead to an 'instável' situation for the inhabitants.

A sua saúde está instável (não está boa), e as condições de vida dele são precárias (de baixa qualidade e inseguras).

instável vs Incerto

Both imply unpredictability.

'Incerto' means uncertain, unknown, or doubtful, focusing on the lack of knowledge about the future. 'Instável' means lacking firmness or steadiness, prone to change or collapse. A situation can be both 'instável' and 'incerto'. For example, the future of a company might be 'incerto' (unknown outcome) and also 'instável' (its current operations are shaky and might fail).

O futuro da empresa é incerto (não sabemos o que vai acontecer), e a sua situação financeira é instável (pode falir).

instável vs Frágil

Both can imply a lack of robustness.

'Frágil' means easily broken or damaged, emphasizing a lack of physical strength. 'Instável' means not steady or firm, prone to collapse or significant change. A glass is 'frágil' (easily broken), but a tower built on shaky ground is 'instável' (prone to falling over).

O vaso é frágil (pode quebrar), mas a torre é instável (pode cair).

句型

A1

Noun + está/é + instável.

A cadeira está instável.

A1

O/A + Noun + está/é + instável.

O tempo é instável.

A2

Ter + um/uma + [noun] + instável.

Tivemos uma conexão instável.

A2

Adverb + instável.

O mercado está muito instável.

B1

Ser/Estar + instável + noun.

É uma situação instável.

B1

Noun + [verb] + instável + noun.

O crescimento instável preocupou os economistas.

B2

Clause + como + instável.

A economia global é vista como instável.

C1

Complex sentence with 'instável' in a subordinate clause.

Apesar de ser instável, o terreno permitiu a construção.

词族

名词

instabilidade

形容词

instável

相关

estável
estabilidade
estabilizar
desestabilizar
desestabilização
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如何使用

frequency

Common

常见错误
  • Using 'ser instável' for temporary conditions. → Estar instável

    Learners often confuse 'ser' and 'estar'. 'Ser instável' describes an inherent quality, while 'estar instável' describes a current, temporary state. For example, the weather is usually 'estar instável', not 'ser instável'.

  • Thinking 'instável' changes for gender. → 'Instável' remains the same for masculine and feminine singular.

    Adjectives ending in -l, like 'instável', do not change their form for gender in the singular. The plural is 'instáveis'. So, 'o chão instável' and 'a ponte instável' are correct.

  • Using 'instável' when 'inconstante' or 'volátil' would be more precise. → Choose based on nuance.

    'Instável' implies a risk of collapse or significant disruption. 'Inconstante' means frequently changing but not necessarily risky. 'Volátil' implies very rapid, dramatic changes. For example, a person's mood might be 'inconstante', while a market might be 'volátil' or 'instável'.

  • Overusing 'instável' for general uncertainty. → Use more specific words like 'incerto' or 'difícil' when appropriate.

    'Instável' specifically refers to a lack of stability or firmness. If a situation is simply uncertain or difficult without implying a risk of collapse or significant fluctuation, words like 'incerto' (uncertain) or 'difícil' (difficult) might be better.

  • Incorrect pluralization. → instáveis

    Forgetting to add the 's' for the plural form. For example, saying 'as situações instável' instead of 'as situações instáveis'.

小贴士

Ser vs. Estar

Remember to distinguish between 'ser instável' (inherent characteristic) and 'estar instável' (temporary state). This is crucial for accurate meaning. For example, 'O material é instável' implies it's always unstable, while 'O material está instável' suggests it's unstable right now due to external factors.

Stress Pattern

The stress in 'instável' falls on the second syllable: ins-TÁ-vel. Practicing this stress pattern will make your pronunciation sound more natural and understandable to native speakers.

Visual Association

Create a strong visual image for 'instável'. Imagine a wobbly table about to fall, or a precarious stack of objects. Associating the word with a clear, memorable image will help you recall it more easily.

Plural Form

The plural form of 'instável' is 'instáveis'. Remember to use this when referring to multiple unstable things. For example, 'As condições climáticas são instáveis esta semana.'

Sentence Building

Actively try to build sentences using 'instável' in different contexts. Start with simple sentences and gradually move to more complex ones, incorporating 'ser' vs. 'estar' and various nouns.

Synonym Nuances

When learning 'instável', also learn related words like 'volátil', 'inconstante', and 'precário'. Understanding their subtle differences will allow you to choose the most precise word for your intended meaning.

Active Listening

When listening to Portuguese, try to identify instances of 'instável'. Note down the surrounding words and the context to understand how it's used in natural speech.

Descriptive Writing

Use 'instável' in your writing to add descriptive detail. Instead of just saying something is 'not good', describe why it's problematic by calling it 'instável' if it lacks steadiness or firmness.

Cultural Relevance

Consider how 'instável' might be used in discussions relevant to Portuguese-speaking cultures, such as economic challenges or political transitions. This connection can make the word more meaningful and memorable.

记住它

记忆技巧

Imagine an 'in'-side of a 'stable' that is falling down. The 'in'-side is 'instável'. Or, think of 'insta'-ntly falling down - it's 'instável'.

视觉联想

Picture a wobbly table with one leg much shorter than the others, about to tip over. The table is clearly 'instável'. Or, visualize a shaky bridge with missing planks.

Word Web

Unpredictable Shaky Wobbly Fluctuating Precarious Unreliable Changeable Flimsy

挑战

Try to describe five things around your home or in your daily life that are 'instável', using the word in a sentence for each. Then, describe five things that are 'estável' and contrast them.

词源

The word 'instável' comes from the Latin word 'instabilis', which is formed by the prefix 'in-' (meaning 'not') and 'stabilis' (meaning 'stable'). This etymology directly reflects its meaning: not stable.

原始含义： Not firm, not steady, changeable.

Indo-European > Italic > Latin > Romance > Portuguese

文化背景

When describing people or their emotional states as 'instável', it should be done with care, as it can carry a negative connotation of being unreliable or difficult to deal with. It's generally better to use more specific terms if possible, unless referring to a medically diagnosed condition.

In English, 'unstable' carries similar connotations of lacking firmness, being prone to collapse, or undergoing rapid change. The contexts in which 'unstable' is used in English often mirror those in Portuguese for 'instável'.

The phrase 'Terra instável' (unstable ground) is often used metaphorically to describe difficult or uncertain situations in literature and journalism. Discussions about the political climate in various Portuguese-speaking countries frequently use 'instável' to describe periods of uncertainty or unrest. The concept of 'instabilidade econômica' (economic instability) is a recurring theme in discussions about development and global finance.

在生活中练习

真实语境

Describing physical objects or structures that are not firm and might fall or break.

  • A mesa está instável.
  • O chão é instável.
  • A estrutura parece instável.

Talking about weather conditions that change rapidly and unpredictably.

  • O tempo está instável hoje.
  • Previsão de clima instável.
  • Um dia instável.

Discussing economic or financial markets that fluctuate significantly.

  • O mercado está instável.
  • Preços instáveis.
  • Uma economia instável.

Referring to personal situations, health, or emotional states that are precarious or unpredictable.

  • A saúde dele está instável.
  • Um período instável na carreira.
  • Seu humor é instável.

Describing political or social situations characterized by uncertainty or unrest.

  • A situação política é instável.
  • Um governo instável.
  • Um período socialmente instável.

对话开场白

"Do you think the weather will be stable or unstable this week?"

"What's something in your daily life that feels unstable right now?"

"Have you ever experienced an unstable internet connection? How did it affect you?"

"When talking about politics, what makes a situation seem unstable to you?"

"Can you think of a time when something you thought was stable turned out to be unstable?"

日记主题

Describe a physical object that is unstable and the risks it poses.

Reflect on a time when your emotions felt unstable. What caused it, and how did you cope?

Write about an unstable economic situation you've observed or experienced. What were the consequences?

Imagine a fictional character whose life is unstable. What challenges do they face?

Consider the difference between something being 'instável' and 'incerto'. Write a short piece exploring this distinction with examples.

常见问题

10 个问题

The difference lies in the permanence of the instability. Use 'ser instável' to describe an inherent, characteristic quality of instability (e.g., 'Este tipo de solo é instável para construção' - This type of soil is inherently unstable for construction). Use 'estar instável' for a temporary state or condition (e.g., 'O preço das ações está instável hoje' - The stock price is unstable today). Think of 'ser' for 'what it is' and 'estar' for 'how it is' right now.

No, 'instável' is an adjective that ends in '-l', and adjectives ending in '-l' typically have the same form for masculine and feminine singular. So, it's 'o chão instável' (masculine) and 'a ponte instável' (feminine). The plural form is 'instáveis'.

Yes, 'instável' can be used to describe people's moods or emotional states if they are prone to rapid or unpredictable changes (e.g., 'Ele tem um temperamento instável'). However, use this with caution, as it can be a negative descriptor. Sometimes, 'inconstante' (inconstant) might be a softer alternative for frequent mood changes.

The most direct opposite of 'instável' is 'estável' (stable). Other antonyms depending on context include 'firme' (firm), 'seguro' (safe/secure), and 'consistente' (consistent).

'Instável' is a more general term for anything lacking steadiness, including a risk of collapse or significant change. 'Volátil' implies very rapid, often dramatic, and potentially explosive changes, typically used for financial markets, chemical reactions, or volatile temperaments. If something is just shaky or unpredictable without necessarily changing extremely quickly, 'instável' is usually more appropriate.

Absolutely. 'Instável' is frequently used for abstract concepts like political situations ('situação política instável'), economic conditions ('economia instável'), or even relationships ('relacionamento instável') to denote uncertainty, lack of firm footing, or proneness to rapid change or breakdown.

You would say 'conexão instável'. For example, 'Tive uma conexão instável durante a reunião.' (I had an unstable connection during the meeting.)

The plural form is 'instáveis'. For example, 'As condições climáticas são instáveis.' (The climatic conditions are unstable.)

While 'instável' often carries a negative connotation due to the implied risk or lack of reliability, it's not always negative. In scientific or artistic contexts, 'instável' can describe a natural state of flux or a deliberate artistic choice to explore change and impermanence. However, in everyday contexts, it usually implies a problem or a risk.

No, 'instável' is an adjective. The related noun is 'instabilidade' (instability). For example, 'A instabilidade econômica é um problema.' (Economic instability is a problem.)

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