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C1 adjective 16分で読める

reativo

例文
解説 reativo in your Level:
At the A1 level, you are just starting to learn Portuguese. The word 'reativo' is an adjective, which means it describes a noun. It is similar to the English word 'reactive'. It means that something or someone reacts to things that happen around them. For example, if you touch a hot pan, you pull your hand away. That is a reaction. In basic Portuguese, you might use this word to describe an animal or a person who gets angry or scared easily when something happens. To use it, you need to match it with the noun. If the noun is masculine, like 'o menino' (the boy), you say 'ele é reativo'. If the noun is feminine, like 'a menina' (the girl), you say 'ela é reativa'. You use the verb 'ser' (to be) with it. For example: 'O cachorro é reativo' (The dog is reactive). This means the dog barks or reacts when it sees something. It is a good word to know, but at this level, you will mostly hear it when people talk about behavior or simple science. Remember that it changes to 'reativos' for plural masculine and 'reativas' for plural feminine. Practice saying 'Eu sou reativo' or 'Eu não sou reativo' to talk about yourself.
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At the A2 level, you can start using 'reativo' in more everyday situations. You already know it means 'reactive', but now you can understand it better when people talk about habits or work. When someone is 'reativo', they wait for a problem to happen before they fix it. They do not plan ahead. For example, if your car makes a strange noise and you wait until it breaks down to take it to the mechanic, that is a reactive behavior. In Portuguese, we say 'um comportamento reativo'. You will often hear this word compared to 'proativo' (proactive), which means planning ahead. You can use it in simple sentences about work: 'Meu chefe não gosta de funcionários reativos' (My boss doesn't like reactive employees). You also need to know the preposition to use. We use 'a' (to). For example, 'reativo ao barulho' (reactive to noise). If you have a pet, you might say to the vet, 'Meu gato é muito reativo a estranhos' (My cat is very reactive to strangers). This means the cat gets scared or aggressive when it sees people it doesn't know. Start paying attention to how people use this word when they complain about bad service or bad planning.
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At the B1 level, your understanding of 'reativo' expands into professional and psychological contexts. You can now use it to express more complex opinions about how people and organizations behave. In the workplace, being 'reativo' is usually seen as a negative trait. It implies a lack of initiative. You can use it in job interviews or when discussing projects. For instance, 'Nossa equipe precisa parar de ser reativa e começar a planejar o futuro' (Our team needs to stop being reactive and start planning for the future). In psychology or self-improvement talks, 'reativo' describes someone who lets their emotions control them. If someone insults you and you immediately shout back without thinking, you are being reactive. You can discuss this by saying, 'Eu tento não ser tão reativo quando recebo críticas' (I try not to be so reactive when I receive criticism). Grammatically, pay attention to the crasis (crase) when using the preposition 'a' before feminine nouns. For example, 'reativo à mudança' (reactive to change). You should also know that in medical contexts, a 'resultado reativo' on a test means positive, showing a reaction occurred in the lab.
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At the B2 level, you are expected to use 'reativo' with precision in professional, academic, and technical discussions. You should be comfortable contrasting it with synonyms and antonyms like 'proativo', 'passivo', and 'responsivo'. In a corporate environment, you can write emails or reports analyzing strategies. For example: 'A estratégia de marketing atual é puramente reativa às ações da concorrência, o que nos coloca em desvantagem' (The current marketing strategy is purely reactive to the competition's actions, which puts us at a disadvantage). You should also understand its usage in IT and science. If you work in tech, you will encounter 'programação reativa' (reactive programming), referring to systems that respond to data streams. In chemistry, 'altamente reativo' describes volatile elements. You must master the nuances: 'responsivo' is positive (quick to respond), while 'reativo' in a behavioral sense is negative (lacking foresight). Use adverbs to modify the intensity, such as 'extremamente reativo' or 'pouco reativo'. Your sentences should flow naturally, integrating this adjective into complex structures, such as conditional clauses: 'Se continuarmos sendo reativos, perderemos nossa fatia de mercado' (If we continue being reactive, we will lose our market share).
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At the C1 level, 'reativo' becomes a tool for sophisticated analysis and critique. You can deploy it in debates, academic essays, and high-level professional presentations to dissect organizational behavior, systemic flaws, or psychological patterns. You understand that reactivity is not just a personal flaw, but can be a systemic issue. For example, you might analyze a government's policy: 'As medidas governamentais adotadas para conter a crise foram meramente reativas, evidenciando uma falha estrutural no planejamento a longo prazo' (The government measures adopted to contain the crisis were merely reactive, evidencing a structural failure in long-term planning). In advanced psychology, you can discuss 'reatividade emocional' (emotional reactivity) as a clinical concept, exploring how trauma or stress triggers automatic defense mechanisms. You are also fully aware of the false friends and pitfalls; you would never translate 'responsive design' as 'design reativo' (always 'responsivo'), nor would you confuse 'reativo' with the political term 'reacionário' (reactionary). Your command of prepositions and crasis is flawless ('reativo às demandas', 'reativo aos estímulos'). You can use the word seamlessly to convey nuanced evaluations of efficiency, emotional intelligence, and scientific phenomena.
At the C2 level, your mastery of 'reativo' is indistinguishable from that of a highly educated native speaker. You appreciate the word's polysemy and can play with its connotations across different domains—from the literal chemical reactivity of a reagent to the metaphorical reactivity of financial markets or literary characters. You can engage in abstract philosophical or sociological discourse, discussing how modern society's constant connectivity fosters a 'cultura reativa' (reactive culture), where individuals are perpetually responding to notifications and outrages rather than engaging in deep, proactive thought. You might write: 'A liquidez das relações contemporâneas gera um indivíduo hiper-reativo, cuja agência é diluída na torrente ininterrupta de estímulos digitais' (The liquidity of contemporary relationships generates a hyper-reactive individual, whose agency is diluted in the uninterrupted torrent of digital stimuli). You understand the subtle irony when 'reativo' is used euphemistically in corporate jargon to mask incompetence. Your vocabulary is rich enough to substitute it with highly specific terms depending on the exact shade of meaning required, yet you know exactly when 'reativo' is the most precise, elegant, and impactful choice to articulate your argument.
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例文

The Portuguese word reativo is an adjective that describes a person, system, or substance that reacts to stimuli, situations, or changes, rather than initiating action or controlling the environment proactively. In the context of human behavior, being described as reativo often carries a slightly negative connotation in professional environments, suggesting that the individual waits for problems to occur before taking action, rather than anticipating them. However, in scientific and psychological contexts, it is a neutral descriptive term denoting the capacity to respond to external factors.

Psychological Context
In psychology, a reactive individual is someone whose emotions or behaviors are easily triggered by external events. This means their emotional state is highly dependent on their environment, often leading to impulsive or defensive responses when faced with criticism or stress.

Understanding the distinction between proactive and reactive behaviors is fundamental in modern Portuguese corporate culture. A proactive employee anticipates needs and solves problems before they escalate, whereas a reactive employee only addresses issues after they have manifested, often resulting in a constant state of crisis management. This dichotomy is frequently discussed in performance reviews and leadership training programs across Brazil and Portugal.

O gerente percebeu que a equipe de suporte era muito reativa, resolvendo problemas apenas quando os clientes reclamavam.

In the realm of chemistry and biology, reativo is used to describe substances that readily undergo chemical reactions when combined with other substances. For example, a highly reactive chemical must be stored carefully to prevent unintended explosions or degradation. Similarly, in medicine, a patient might be described as reactive to a specific treatment or allergen, indicating that their body is producing a physiological response.

Scientific Usage
In laboratory settings, 'reativo' is also used as a noun (reagent) to denote a substance or mixture for use in chemical analysis or other reactions. However, as an adjective, it describes the volatility or responsiveness of the element itself.

O sódio é um metal altamente reativo quando entra em contato com a água.

The term has also found significant usage in the technology sector, particularly in software development. 'Programação reativa' (reactive programming) is a programming paradigm oriented around data flows and the propagation of change. This means that when a data value changes, the system automatically updates the related components, making the software highly responsive to user inputs and environmental variables.

Technological Context
Reactive systems in computer science are designed to be responsive, resilient, elastic, and message-driven. This usage strips away any negative connotation the word might have in human resources, focusing entirely on efficiency and dynamic adaptation.

Nós decidimos adotar uma arquitetura reativa para lidar com o alto volume de tráfego no aplicativo.

Furthermore, in the context of interpersonal relationships, being reactive can hinder effective communication. A reactive listener is often planning their rebuttal while the other person is still speaking, rather than truly absorbing the information. This leads to conflicts that escalate quickly because the responses are driven by immediate emotional reflexes rather than thoughtful consideration. Therefore, therapists and counselors often work with clients to help them move from a reactive state to a more mindful, intentional way of interacting with their partners and family members.

Durante a terapia de casal, eles aprenderam a não ter um comportamento tão reativo durante as discussões financeiras.

In summary, the word 'reativo' is incredibly versatile in Portuguese. Its meaning shifts from a critique of passivity in the corporate world to a description of chemical volatility in the laboratory, and finally to a standard of excellence and responsiveness in software engineering. Mastering the different contexts in which this word is used will significantly elevate your fluency and allow you to navigate complex conversations in professional, academic, and personal settings with native-like precision.

O cachorro era muito reativo a barulhos altos, latindo para qualquer som de trovão.

Using the adjective reativo correctly in Portuguese requires an understanding of gender and number agreement, as well as the specific prepositions that often accompany it. Like most adjectives in Portuguese, 'reativo' must agree in gender (masculine or feminine) and number (singular or plural) with the noun it modifies. The four forms are: reativo (masculine singular), reativa (feminine singular), reativos (masculine plural), and reativas (feminine plural). This agreement is mandatory and is one of the first grammatical rules learners must master to sound natural.

Gender and Number Agreement
Always check the noun before applying the adjective. For example, 'o comportamento' (the behavior) is masculine singular, so it takes 'reativo'. 'A substância' (the substance) is feminine singular, so it takes 'reativa'. 'Os funcionários' (the employees) takes 'reativos', and 'as atitudes' (the attitudes) takes 'reativas'.

As políticas da empresa são puramente reativas, nunca prevenindo os problemas antes que aconteçam.

When it comes to sentence structure, 'reativo' usually follows the noun it modifies, which is the standard position for descriptive adjectives in Portuguese. Placing it before the noun is highly unusual and would sound unnatural or overly poetic, which does not fit the analytical or corporate tone this word usually carries. For instance, you would say 'um sistema reativo' and never 'um reativo sistema'.

Prepositional Usage
When you want to specify what someone or something is reacting to, you must use the preposition 'a' (to). This often requires contraction with definite articles, resulting in 'ao' (a + o), 'à' (a + a), 'aos' (a + os), or 'às' (a + as). The structure is: [Noun] + [Verb 'ser/estar'] + reativo + a + [Stimulus].

O paciente não está sendo reativo ao novo tratamento antibiótico.

Another important syntactic consideration is the choice of verb. 'Reativo' is most commonly paired with the linking verbs 'ser' (to be - permanent) and 'estar' (to be - temporary). Using 'ser reativo' implies a permanent character trait or a fundamental property of a substance. For example, 'Ele é muito reativo' means he is generally a reactive person. On the other hand, using 'estar reativo' implies a temporary state. For instance, 'Ele está muito reativo hoje' means he is acting defensively or impulsively today, perhaps due to stress or lack of sleep.

Devido ao cansaço extremo, o motorista estava menos reativo aos perigos da estrada.

Modifiers and Adverbs
You can amplify or diminish the intensity of the reactivity using adverbs of intensity such as 'muito' (very), 'pouco' (little/not very), 'altamente' (highly), or 'extremamente' (extremely). These adverbs always precede the adjective.

O mercado financeiro tem se mostrado extremamente reativo às notícias políticas internacionais.

It is also possible to use 'reativo' in a comparative or superlative structure. To say someone is more reactive than someone else, you use 'mais reativo que' or 'mais reativo do que'. To say someone is the most reactive, you use 'o mais reativo'. This is particularly useful in comparative psychology or comparative chemistry, where you need to establish a hierarchy of responsiveness among different subjects or elements.

Entre todos os elementos testados no laboratório, o potássio foi o mais reativo.

By mastering these grammatical rules, you will be able to construct complex, accurate sentences that convey exactly the level of reactivity you intend to describe. Whether you are writing a performance review in a corporate setting, discussing a chemical experiment, or analyzing psychological behavior, the correct application of gender, number, prepositions, and verb choices will ensure your Portuguese is clear, professional, and grammatically impeccable.

The word reativo is not a slang term or a word you will frequently encounter in casual, everyday street conversations. Instead, it belongs primarily to the professional, academic, and technical registers of the Portuguese language. Understanding the specific environments where this word is naturally spoken will help you gauge when it is appropriate to use it yourself. It is a word that signals a certain level of education, analytical thinking, and professional vocabulary.

Corporate and Business Environments
This is arguably the most common place you will hear 'reativo' in its behavioral sense. Human resources professionals, managers, and business consultants use it constantly during performance evaluations, strategic planning meetings, and leadership seminars. It is almost always used in contrast with 'proativo' (proactive).

Precisamos mudar nossa cultura corporativa; estamos sendo muito reativos em relação aos movimentos da concorrência.

In a business context, a company might have a 'postura reativa' (reactive stance), meaning they only innovate or change their strategies when forced to by market pressures or competitors, rather than leading the market through innovation. You will read this word in business magazines like Exame or Você S/A, and hear it on LinkedIn posts from Portuguese and Brazilian thought leaders discussing management styles and organizational behavior.

Psychology and Therapy
In clinics and counseling sessions, psychologists use 'reativo' to describe emotional responses. A 'comportamento reativo' is an automatic, often unthinking emotional reaction to a trigger, usually rooted in past trauma or stress. Therapists work with patients to recognize these reactive patterns.

O psicólogo explicou que o choro repentino da criança era um mecanismo reativo ao estresse familiar.

You will also hear this term in modern self-help literature and podcasts focusing on emotional intelligence. The phrase 'não seja tão reativo' (don't be so reactive) is a common piece of advice given by mindfulness coaches, encouraging people to pause and breathe before responding to an insult or a stressful situation. It is a key concept in emotional regulation strategies taught in workshops and wellness retreats across the lusophone world.

Science, Medicine, and Technology
In laboratories, hospitals, and IT departments, 'reativo' is a standard technical term. It describes chemical volatility, immunological responses (like a reactive test result for a virus), and software architectures designed to respond to data streams.

O exame de sangue mostrou um resultado reativo para a presença de anticorpos.

In the tech industry, specifically software engineering, 'programação reativa' (reactive programming) is a buzzword. Developers use frameworks like React or RxJS to build systems that are inherently reactive. You will hear this constantly in daily stand-up meetings, tech conferences, and code reviews in cities with booming tech scenes like São Paulo, Lisbon, and Florianópolis.

O desenvolvedor sugeriu o uso de uma biblioteca reativa para melhorar a interface do usuário.

A defesa civil adotou um plano reativo após as enchentes devastarem a cidade.

Finally, in sports journalism and commentary, a team might be described as playing 'futebol reativo'. This means the team does not try to control the possession of the ball or dictate the pace of the game. Instead, they sit back in defense, absorb the pressure from the opposing team, and wait for an opportunity to launch a quick counter-attack. It is a specific tactical style that is frequently debated by pundits on sports networks like SporTV or ESPN Brasil.

When English speakers learn the Portuguese word reativo, they often encounter a few specific stumbling blocks. These mistakes usually stem from direct translations from English, confusion with similar-sounding words, or a misunderstanding of the cultural connotations the word carries in different contexts. By identifying these common errors, you can refine your usage and speak with greater accuracy and confidence.

Confusion with 'Reacionário'
One of the most severe mistakes a learner can make is confusing 'reativo' with 'reacionário'. While 'reativo' means acting in response to a stimulus, 'reacionário' is a political term meaning reactionary—someone who strongly opposes political or social reform and wishes to return to a previous, often conservative, state of society. Calling a colleague 'reacionário' instead of 'reativo' will completely change the meaning of your sentence and likely cause offense.

Ele tem um perfil muito reativo no trabalho, sempre esperando ordens para agir.

Another common mistake is misusing 'reativo' when trying to say that a website or application looks good on mobile devices. In English, we call this 'responsive design'. In Portuguese, learners sometimes directly translate this to 'design reativo'. However, the correct industry term in Portuguese is 'design responsivo'. While 'programação reativa' (reactive programming) exists, it refers to data flow, not the visual layout adapting to screen sizes.

Incorrect Preposition Usage
English speakers often struggle with the preposition that follows 'reativo'. In English, we say 'reactive TO something'. In Portuguese, the preposition is 'a', but learners often forget to contract it with the definite article of the following noun, or they incorrectly use 'para' (for) or 'com' (with).

O cachorro é muito reativo a outros cães durante o passeio.

For example, saying 'Ele é reativo com as críticas' is grammatically incorrect. The proper phrasing is 'Ele é reativo às críticas'. The 'a' preposition merges with the feminine plural article 'as', creating the crasis 'às'. Failing to use the correct prepositional contraction is a dead giveaway that you are not a native speaker and can make your sentence sound clunky.

O governo foi duramente criticado por ter uma postura reativa diante da crise econômica.

Misunderstanding the Connotation
In English, being 'reactive' can sometimes just mean being capable of responding. In Portuguese corporate culture, describing someone as 'reativo' is almost exclusively a negative criticism. It means they lack initiative.

Learners sometimes try to compliment a colleague by saying they are 'muito reativos' when they actually mean they are quick to respond to emails or requests. In this scenario, the Portuguese speaker will likely feel insulted, thinking they are being called passive or lacking foresight. If you want to praise someone's quick response time, the correct word is 'ágil' (agile), 'rápido' (fast), or 'responsivo' (responsive). Reserve 'reativo' for situations where you specifically want to point out a lack of proactive behavior or describe a chemical/technical property.

Sua atitude reativa está prejudicando o andamento do projeto, pois você nunca antecipa os riscos.

O material usado na construção não deve ser reativo à umidade para evitar corrosão.

To truly master Portuguese vocabulary, it is essential to understand the nuances between reativo and its synonyms, as well as its antonyms. Choosing the right alternative can significantly alter the tone of your sentence, making it either more diplomatic, more precise, or more appropriate for the specific context, whether you are in a boardroom, a laboratory, or a therapist's office. Let us explore the lexical field surrounding this versatile adjective.

Proativo (Proactive)
This is the absolute and most common antonym of 'reativo' in the corporate and behavioral worlds. While a reactive person waits for things to happen to respond, a proactive person anticipates problems, takes initiative, and controls the situation before it escalates. It is the golden standard of modern professional behavior.

A empresa prefere contratar profissionais proativos em vez de funcionários com perfil reativo.

Another word frequently compared with 'reativo' is 'passivo' (passive). While both share a lack of initial action, they are not perfect synonyms. A passive person might not react at all, simply accepting what happens to them without resistance or response. A reactive person, however, definitely responds, but only after the stimulus has occurred. Therefore, 'passivo' implies a complete lack of action, whereas 'reativo' implies delayed or triggered action.

Responsivo (Responsive)
This is a very important distinction. 'Responsivo' means quick and positive in reacting. It is a compliment. If a customer service team is 'responsiva', they answer queries quickly and effectively. If they are 'reativa', it implies they only fix things when customers complain loudly. In web design, 'responsivo' means the layout adapts to the screen size.

O suporte técnico não foi apenas reativo, mas altamente responsivo às nossas necessidades urgentes.

In psychological contexts, 'impulsivo' (impulsive) is sometimes used alongside 'reativo'. An impulsive person acts without thinking, driven by sudden desires. A reactive person acts in response to a trigger. While an impulsive act can be reactive (lashing out when insulted), an impulsive act can also be proactive (suddenly deciding to buy a car). Therefore, while they overlap in emotional contexts, they describe different mechanisms of behavior.

Sensível (Sensitive)
In scientific and medical contexts, 'sensível' can sometimes replace 'reativo'. For example, a patient might be 'sensível' (sensitive) to a medication, meaning their body reacts to it. However, 'reativo' is more technical and implies a measurable, often chemical or immunological, response.

A pele do bebê é muito sensível e apresenta um padrão reativo a tecidos sintéticos.

Finally, we have 'reflexo' (reflexive), which relates to an involuntary physical response. If you touch a hot stove, pulling your hand away is a 'movimento reflexo'. While this is technically a reactive behavior, the word 'reativo' is rarely used to describe basic physiological reflexes in everyday speech. 'Reativo' implies a slightly more complex system of response, whether emotional, chemical, or organizational. By understanding these subtle differences, you can choose the exact word you need to express your thoughts with clarity and precision.

O modelo de negócios deles é puramente reativo, copiando o que os líderes de mercado já fizeram.

Para evitar um comportamento reativo durante a negociação, prepare suas respostas com antecedência.

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レベル別の例文

1

O cachorro é muito reativo.

The dog is very reactive.

'Reativo' agrees with the masculine singular noun 'cachorro'.

2

A menina não é reativa.

The girl is not reactive.

'Reativa' agrees with the feminine singular noun 'menina'.

3

O gato é reativo ao som.

The cat is reactive to the sound.

Use the preposition 'a' + 'o' (ao) before the masculine noun 'som'.

4

Eles são meninos reativos.

They are reactive boys.

'Reativos' is the masculine plural form.

5

Eu sou uma pessoa reativa.

I am a reactive person.

'Pessoa' is feminine, so use 'reativa' even if the speaker is male.

6

O metal é reativo.

The metal is reactive.

Used here in a basic science context.

7

Ela está muito reativa hoje.

She is very reactive today.

Using 'estar' implies a temporary state of reactivity.

8

O teste foi reativo.

The test was reactive.

In medical terms, 'reativo' often means a positive result.

1

Meu chefe disse que eu sou muito reativo.

My boss said that I am very reactive.

Used in a basic workplace context to describe behavior.

2

O sistema é reativo a falhas.

The system is reactive to failures.

'A falhas' uses the preposition 'a' without the article, meaning 'to failures' in general.

3

Nós precisamos ser menos reativos.

We need to be less reactive.

'Menos' (less) modifies the adjective 'reativos'.

4

O paciente foi reativo ao remédio.

The patient was reactive to the medicine.

'Ao remédio' shows the specific stimulus causing the reaction.

5

Animais reativos precisam de espaço.

Reactive animals need space.

Adjective following the noun it modifies in plural form.

6

O mercado está reativo às notícias.

The market is reactive to the news.

Note the crasis 'às' (a + as) before the feminine plural noun 'notícias'.

7

Ela tem um comportamento reativo.

She has a reactive behavior.

'Comportamento' is a common noun paired with 'reativo'.

8

O produto químico é altamente reativo.

The chemical product is highly reactive.

'Altamente' (highly) is an adverb of intensity.

1

A postura da empresa foi totalmente reativa diante da crise.

The company's stance was totally reactive in the face of the crisis.

'Postura' is feminine, requiring 'reativa'.

2

Em vez de ser proativo, ele sempre tem uma atitude reativa.

Instead of being proactive, he always has a reactive attitude.

Contrasting 'proativo' with 'reativo' is very common.

3

O exame de sangue apresentou um resultado reativo para a doença.

The blood test showed a reactive result for the disease.

Standard medical terminology for a positive test.

4

Cães reativos geralmente agem por medo, não por agressividade.

Reactive dogs usually act out of fear, not aggression.

Explaining the psychological motivation behind the reactivity.

5

A programação reativa ajuda a criar aplicativos mais rápidos.

Reactive programming helps to create faster applications.

Introduction to the IT specific usage of the term.

6

Tente não ser tão reativo quando receber um feedback negativo.

Try not to be so reactive when receiving negative feedback.

Using the imperative 'tente' with the adjective.

7

O sódio é um elemento extremamente reativo com a água.

Sodium is an extremely reactive element with wate

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