At the A1 level, '適応する' (tekioo suru) is a bit advanced, but you can think of it as a fancy way to say 'to change yourself to fit a new place.' Imagine you go to a new school. You have to learn the new rules and make new friends. This process of changing your behavior so you can live happily in the new school is what 'tekioo suru' means. It is usually used with the particle 'ni' (に). For example, '新しい学校に適応する' (Atarashii gakko ni tekioo suru) means 'to adapt to a new school.' Even at this early stage, knowing this word helps you describe how you are doing in Japan. You can say 'Nihon no seikatsu ni tekioo shite imasu' (I am adapting to life in Japan) to sound more mature than just saying 'I am okay.' Focus on the idea of 'fitting in' to a new environment. It is a big word for a big change!
At the A2 level, you can start using '適応する' to describe social and physical changes. You might use it when talking about moving to a new city or starting a new hobby that has many rules. For example, if you move from a warm country to a cold country like Japan in winter, you have to 'tekioo suru' to the cold weather. This means you buy a heavy coat and learn how to use a heater. It is more than just 'getting used to it'; it is taking action to survive and be comfortable. You will often see this word in simple news articles or textbooks about society. Remember the structure: [Environment] + に + 適応する. You can also use the past tense 'tekioo shita' to say you have successfully finished the process of adjusting. It is a very useful word for talking about your personal growth and the challenges of living in a different culture.
At the B1 level, '適応する' becomes an essential part of your vocabulary for discussing work, society, and nature. You should understand that this word implies a functional adjustment. In a professional setting, it refers to how well you can handle a new job's demands or a company's culture. For instance, 'Shigoto no yarigata ni tekioo suru' means adapting to the way work is done. You should also be able to use the potential form 'tekioo dekiru' (can adapt) to describe your skills during an interview. At this level, you might also encounter the noun 'tekioo' in compound words like 'tekioo-ryoku' (adaptability). This is considered a very important 'soft skill' in Japan. You are expected to know that 'tekioo suru' is more formal than 'nareru' and is used when the context involves a system, a set of rules, or a biological requirement. It shows you have a deeper grasp of Japanese nuances.
At the B2 level, you should be comfortable using '適応する' in abstract and complex discussions. This includes talking about how businesses must adapt to economic shifts ('keizai no henka ni tekioo suru') or how societies adapt to new technologies like AI. You will notice that at this level, the word is often used in the passive or causative forms to describe systemic pressures. For example, 'atarashii kankyo ni tekioo saseru' (to make something adapt to a new environment). You should also be able to distinguish 'tekioo' from similar academic terms like 'jun'nou' (acclimatization) or 'tekigou' (conformity). In essays or formal debates, 'tekioo suru' is the standard verb for discussing Darwinian evolution or psychological resilience. You should also be aware of the term 'tekioo shougai' (adjustment disorder), which is a common topic in Japanese media regarding workplace stress. Using this word correctly in these contexts demonstrates a high level of linguistic and cultural competence.
At the C1 level, your use of '適応する' should be precise and nuanced, reflecting an understanding of its technical and philosophical implications. You will use it to discuss how legal systems adapt to modern societal values or how linguistic structures adapt over centuries. In a professional or academic environment, you might use it to describe 'adaptive systems' in engineering or 'adaptive leadership' in management. You should be able to use the word in complex sentence structures, such as 'Henka suru shijou kankyo ni tekioo shi-uru kigyo' (A company capable of adapting to a changing market environment). At this level, you are also expected to recognize the word in classical or highly formal literature where it might describe the historical adaptation of the Japanese people to various foreign influences. Your ability to use 'tekioo suru' to articulate subtle differences between 'adjustment,' 'conformity,' and 'evolution' is a hallmark of advanced proficiency.
At the C2 level, '適応する' is a tool for high-level conceptual analysis. You use it to explore the existential and systemic nature of change. You might discuss the 'limits of adaptation' (tekioo no genkai) in the face of global climate change or the 'psychological adaptation' required in extreme isolation, such as space travel. Your vocabulary will include rare collocations and highly formal variations. You can analyze how the concept of 'tekioo' has evolved in Japanese intellectual history, perhaps contrasting it with traditional concepts like 'wa' (harmony). You will be able to read and critique academic papers in fields like socio-biology or systems theory where 'tekioo' is a core concept. At this level, the word is no longer just a verb for 'adjusting'—it is a lens through which you analyze the relationship between an entity and its environment. You can use it fluently in any register, from a scientific symposium to a high-level diplomatic negotiation, with perfect grammatical and contextual accuracy.

適応する em 30 segundos

  • 適応する (tekioo suru) means to adapt or adjust to a new environment, culture, or system, implying a functional or structural change for success.
  • It is a formal suru-verb used in business, science, and social contexts, distinguishing it from the more casual and habit-based word 'nareru'.
  • The verb always takes the particle 'ni' to indicate the target of adaptation, such as 'kankyo ni tekioo suru' (adapt to the environment).
  • It is commonly used to describe biological evolution, professional growth, and technical compatibility in modern Japanese society and academic literature.

The Japanese verb 適応する (tekioo suru) is a sophisticated and versatile term primarily used to describe the process of adjusting or conforming to new environments, circumstances, or conditions. It is composed of two kanji: 適 (teki) meaning 'suitable' or 'fit,' and 応 (oo) meaning 'respond' or 'react.' Together, they literally translate to 'responding in a suitable way.' This word is essential for learners moving beyond basic conversation into professional, academic, or biological discussions. Unlike the simpler word 慣れる (nareru), which implies getting used to something through habituation or time, 適応する suggests a more active, systemic, or functional change to meet specific requirements. It is used when a person moves to a foreign country and must change their lifestyle, when a business must pivot to meet market demands, or when a biological organism evolves to survive in a changing climate. The nuance is often one of survival, efficiency, or formal alignment.

Social Context
When individuals move to Japan, they must tekioo suru to the local customs, social hierarchies, and communication styles. This isn't just about 'getting used' to the food; it's about shifting one's behavior to function correctly within the society.

新しい環境に早く適応することが、成功の鍵です。(Adapting quickly to the new environment is the key to success.)

Biological Context
In science, this word refers to the evolutionary process where species develop traits that allow them to survive. It is the standard translation for 'biological adaptation' in textbooks.

生物は周囲の環境に適応するために進化します。(Living things evolve in order to adapt to their surrounding environment.)

In a business setting, you will frequently hear this word during performance reviews or strategy meetings. A manager might say that a team needs to adapt to a new software system or a shifting market landscape. The word carries a sense of competence and resilience. It implies that the subject has the flexibility and intelligence to recognize changes and respond appropriately. It is also used in psychology to describe 'maladaptation' (fukitekoo), which is the inability to adjust to life's stressors. Therefore, mastering this word allows you to discuss personal growth, corporate strategy, and scientific phenomena with precision. It is a 'bridge' word that connects everyday experiences with higher-level conceptual thinking in Japanese.

市場の変化に柔軟に適応する必要があります。(It is necessary to adapt flexibly to market changes.)

Technical Context
Software that adjusts its layout to fit different screen sizes is said to 'tekioo' to the device. This is common in UI/UX design discussions in Tokyo's tech hubs.

Using 適応する correctly requires understanding its grammatical structure and the specific particles it pairs with. The most important rule is the use of the particle に (ni). The target of adaptation—whether it is a climate, a new job, a culture, or a set of rules—must be followed by ni. Unlike some verbs that take the direct object particle o, tekioo suru views the environment as a destination or a state to move toward. For example, 'shokuba ni tekioo suru' (to adapt to the workplace). If you use o, it would sound like you are physically manipulating the adaptation itself, which is grammatically incorrect in most contexts.

彼は新しい学校の生活にすぐ適応した。(He quickly adapted to the new school life.)

Another key aspect is the use of adverbs to describe *how* one adapts. Common adverbs paired with this verb include 柔軟に (juunan ni) meaning 'flexibly,' 徐々に (jojo ni) meaning 'gradually,' and 完全に (kanzen ni) meaning 'completely.' These modifiers help clarify whether the adaptation was a struggle or a smooth transition. For instance, 'jojo ni kankyo ni tekioo suru' (to gradually adapt to the environment) suggests a natural, time-based process, whereas 'juunan ni tekioo suru' emphasizes the subject's ability to change their approach as needed.

Negative Form
The negative form 適応できない (tekioo dekinai) is often used to describe social withdrawal or difficulty in fitting in. In Japan, this is sometimes linked to discussions about 'hikikomori' or social anxiety.

急激な変化に適応するのは難しい。(It is difficult to adapt to sudden changes.)

In formal writing, 適応する can be turned into a noun phrase using koto or no. For example, 'tekioo suru koto wa hitsuyoo da' (Adapting is necessary). You will also see it combined with other nouns to form compound words like 適応能力 (tekioo nouryoku), which means 'adaptability' or 'the ability to adapt.' This is a very positive trait to list on a Japanese resume. By using the verb in its potential form, tekioo dekiru, you describe someone who is versatile and capable of thriving anywhere. This versatility makes it a high-frequency word in professional self-introductions (jikoshoukai).

Causative Form
The form 適応させる (tekioo saseru) means 'to make something adapt' or 'to adjust something to.' For example, 'system o shin-os ni tekioo saseru' (to make the system adapt to the new OS).

You will encounter 適応する in a variety of real-world scenarios in Japan, ranging from news broadcasts to office corridors. In the news, it is frequently used during reports on the economy and technology. For instance, when a new law is passed, news anchors will discuss how companies are tekioo suru to the new regulations. You might hear: 'Kigyo wa atarashii kijun ni tekioo shinakereba narimasen' (Companies must adapt to the new standards). This highlights the word's association with compliance and structural adjustment. It sounds more professional than saying 'getting used to the rules.'

AI技術の進歩に、私たちはどう適応するべきでしょうか?(How should we adapt to the progress of AI technology?)

In the workplace, 適応する is a staple of HR discussions and performance feedback. If a new employee is doing well, a senior might say, 'Kare wa shokuba ni umaku tekioo shite iru' (He is adapting well to the workplace). Conversely, if someone is struggling, the term tekioo shougai (adjustment disorder) might be used in a medical or psychological context. This is a very common term in Japan for stress-related issues arising from an inability to cope with work pressure. Hearing this word in a medical context signifies a serious discussion about mental health and environmental fit.

Education
Teachers use this word to describe students moving from elementary to junior high school. It describes the transition from a playful environment to a more disciplined one.

Furthermore, in the world of sports and athletics, commentators use 適応する to describe how a player handles different playing conditions. For example, a baseball player moving from the Japanese leagues to the MLB must tekioo suru to the faster pitches and different ball sizes. You will hear this during interviews: 'Amerika no yakyu ni tekioo suru no ni jikan ga kakari-mashita' (It took time to adapt to American baseball). In this context, the word implies a high level of skill and the mental fortitude required to change one's technique.

現地の気候に適応するのは大変でした。(It was hard to adapt to the local climate.)

One of the most frequent mistakes English speakers make is confusing 適応する (tekioo suru) with 慣れる (nareru). While both can be translated as 'to get used to' or 'to adapt,' their usage is quite different. Nareru is used for becoming accustomed to something through repeated exposure or habit. You 'nareru' to spicy food or 'nareru' to waking up early. Tekioo suru, however, implies a structural or functional change. You don't 'tekioo' to spicy food unless you are talking about your digestive system evolving over generations. Using tekioo suru for simple habits sounds overly robotic or scientific.

Particle Error
Mistake: 環境を適応する (Kankyo o tekioo suru).
Correct: 環境に適応する (Kankyo ni tekioo suru).
Explanation: Always use 'ni' for the environment you are fitting into.

✕ 辛い料理に適応した
○ 辛い料理に慣れた

Another common error is using 適応する when you actually mean 調整する (chousei suru). Chousei suru means 'to adjust' in the sense of fine-tuning a machine or a schedule. If you are 'adjusting' your watch or 'adjusting' a meeting time, you must use chousei suru. Tekioo suru is reserved for broader, more significant changes in response to an environment. If you say you are 'tekioo'ing a meeting, it sounds like the meeting is a living organism trying to survive in a new ecosystem, which is nonsensical.

Confusion with 'Tekisetsu'
Learners often confuse the verb tekioo suru with the adjective tekisetsu (appropriate). While they share the same first kanji, tekisetsu is used to describe a proper action or choice, whereas tekioo is the act of fitting in.

Finally, be careful with the potential form. While tekioo dekiru is common, beginners sometimes try to say tekioo suru koto ga dekiru in places where a simple tekioo dekiru or the noun tekioo-sei (adaptability) would be much more natural. In professional contexts, brevity is valued. Over-explaining the 'ability to adapt' by using long grammatical strings can make you sound less fluent. Stick to 'tekioo-ryoku ga aru' (to have the power to adapt) when talking about skills.

To truly master Japanese, you need to know the alternatives to 適応する and when to use them. While tekioo suru is the most versatile word for adaptation, other words offer specific nuances that can make your Japanese sound more natural and precise. Depending on whether you are talking about machines, social groups, or biological evolution, you might choose a different verb.

順応する (Jun'nou suru)
This is very similar to tekioo suru but often implies a more passive or natural alignment with the environment. It is frequently used for biological adaptation to light or temperature (e.g., your eyes adapting to a dark room).

暗闇に目が順応した。(My eyes adapted/acclimated to the darkness.)

適合する (Tekigou suru)
This means 'to conform' or 'to fit a standard.' It is used for technical compatibility, like a part fitting a machine or a person meeting the requirements for a job. It is less about the *process* of changing and more about the *state* of fitting.

この部品は規格に適合しています。(This part conforms to the standards.)

馴染む (Najimu)
This is a beautiful, more poetic word that means 'to become familiar with' or 'to blend in.' It is often used for new shoes becoming comfortable on your feet, or a new person becoming part of a group. It has a warm, social nuance that tekioo suru lacks.

In a business context, you might also use 対応する (Taiou suru). While tekioo is about long-term adaptation, taiou is about immediate response or handling a specific situation. If a customer complains, you taiou to the complaint. If the entire market changes over five years, you tekioo to the market. Understanding these subtle shifts in meaning will allow you to navigate complex social and professional situations in Japan with confidence. Choosing the right word shows that you understand not just the language, but the cultural expectations attached to each situation.

Exemplos por nível

1

新しい学校に適応する。

I adapt to the new school.

Uses 'ni' to show the target of adaptation.

2

日本の生活に適応したいです。

I want to adapt to life in Japan.

Verb + tai (want to).

3

彼はすぐ適応しました。

He adapted immediately.

Past tense 'shimashita'.

4

環境に適応するのは大切です。

Adapting to the environment is important.

Verb + no wa (nominalizing the verb).

5

ルールに適応してください。

Please adapt to the rules.

Te-form + kudasai (polite request).

6

私はまだ適応していません。

I haven't adapted yet.

Te-iru form (negative state).

7

早く適応しましょう。

Let's adapt quickly.

Mashou (let's).

8

冬の寒さに適応する。

Adapt to the winter cold.

Noun + ni + verb.

1

新しい仕事に適応するのに時間がかかった。

It took time to adapt to the new job.

Verb + no ni (in order to / for the purpose of).

2

動物は自然に適応して生きています。

Animals live by adapting to nature.

Te-form to show means/manner.

3

都会の生活に適応できましたか?

Were you able to adapt to city life?

Potential form 'dekita'.

4

彼は新しいチームに適応しようとしている。

He is trying to adapt to the new team.

Volitional form + to shite iru (trying to).

5

この植物は乾燥に適応している。

This plant is adapted to dryness.

State of being (shite iru).

6

異文化に適応するのは面白いです。

Adapting to a different culture is interesting.

Nominalized verb + adjective.

7

社会に適応するために勉強します。

I study in order to adapt to society.

Tame ni (for the purpose of).

8

急な変化に適応するのは難しい。

It is difficult to adapt to sudden changes.

Adjective 'muzukashii'.

1

市場のニーズに適応する製品を開発する。

Develop products that adapt to market needs.

Verb modifying a noun (seihin).

2

彼はどんな環境にもすぐに適応できる能力がある。

He has the ability to adapt to any environment immediately.

Potential form modifying 'nouryoku'.

3

新しいシステムに適応するよう、社員に求めた。

I asked the employees to adapt to the new system.

Youni (asking/instructing to do something).

4

生物は環境の変化に適応して進化してきた。

Living things have evolved by adapting to environmental changes.

Te-form + kite (continuation from the past).

5

不況に適応するために、コストを削減した。

In order to adapt to the recession, we reduced costs.

Tame ni indicating reason/purpose.

6

海外赴任に適応できず、帰国することになった。

Unable to adapt to the overseas assignment, it was decided I would return home.

Zuni (without doing/negative te-form).

7

子供は大人よりも早く環境に適応する。

Children adapt to environments faster than adults.

Yori mo (comparison).

8

社会の変化に柔軟に適応することが求められている。

Flexible adaptation to social changes is being required.

Passive voice 'motomerarete iru'.

1

グローバル化に適応できない企業は淘汰されるだろう。

Companies that cannot adapt to globalization will likely be weeded out.

Potential negative modifying a noun.

2

そのソフトウェアは、ユーザーの好みに適応して変化する。

The software changes by adapting to user preferences.

Te-form showing manner of change.

3

ストレスに適応する力を高めるトレーニングを受ける。

Undergo training to increase the power to adapt to stress.

Verb modifying 'chikara'.

4

日本の商習慣に適応するのは、外国人にとって容易ではない。

Adapting to Japanese business customs is not easy for foreigners.

Nominalized phrase + negative adjective.

5

状況に応じて、戦略を適応させる必要がある。

It is necessary to make the strategy adapt depending on the situation.

Causative form 'tekioo saseru'.

6

過酷な気候に適応した民族の知恵を学ぶ。

Learn the wisdom of peoples who have adapted to harsh climates.

Past tense modifying 'minzoku'.

7

新しい技術に適応することは、現代社会での必須条件だ。

Adapting to new technology is a prerequisite in modern society.

Nominalized phrase as a subject.

8

彼は周囲の期待に適応しようと無理をしていた。

He was pushing himself too hard trying to adapt to the expectations of those around him.

Volitional + to shite (trying/attempting).

1

法制度が社会の実情に適応するまでには、長い年月を要する。

It takes many years for the legal system to adapt to the actual conditions of society.

Made ni wa (until the time when).

2

生物学的適応のプロセスを分子レベルで解明する。

Elucidate the process of biological adaptation at the molecular level.

Noun form 'tekioo' used in a compound.

3

組織が存続するためには、環境の変化に自己適応しなければならない。

In order for an organization to survive, it must self-adapt to changes in the environment.

Nakereba naranai (must) with 'jiko-tekioo'.

4

彼は文化的な摩擦を乗り越え、現地の社会に見事に適応した。

He overcame cultural friction and adapted brilliantly to the local society.

Adverbial 'migoto ni' modifying the verb.

5

AIが個々の学習者の進度に自動的に適応するシステムを構築する。

Construct a system where AI automatically adapts to the progress of individual learners.

Adverb 'jidouteki ni'.

6

激動の時代に適応しうる強靭な精神を養う。

Cultivate a resilient spirit capable of adapting to turbulent times.

Verb stem + uru (capable of/possible to).

7

その建築物は、地震という極限状態に適応するよう設計されている。

The building is designed to adapt to the extreme state of an earthquake.

Passive voice 'sekkei sarete iru'.

8

言語は使用者のニーズに適応しながら、常に変容し続けている。

Language continues to transform constantly while adapting to the needs of its users.

Nagara (while/as) + tsudukete iru (continue to).

1

生命の本質は、絶え間なき環境への適応と変異の連鎖にある。

The essence of life lies in the chain of constant adaptation to the environment and mutation.

Noun 'tekioo' with the particle 'e' (toward).

2

ポストモダン社会において、個人は流動的なアイデンティティへの適応を強いられている。

In postmodern society, individuals are forced to adapt to fluid identities.

Passive causative 'shiirarete iru' (being forced to).

3

マクロ経済の構造的転換に適応しきれない産業は、衰退の道を辿る。

Industries that cannot fully adapt to the structural shifts in the macroeconomy will follow the path of decline.

Verb stem + kirenai (cannot completely do).

4

人間精神の適応限界を超えたとき、文明は崩壊の危機に瀕する。

When the limits of the human spirit's adaptation are exceeded, civilization faces the risk of collapse.

Noun phrase 'tekioo genkai' (adaptation limit).

5

異質な価値観が衝突する場において、相互に適応し合う寛容さが求められる。

In places where heterogeneous values collide, a tolerance for mutual adaptation is required.

Verb stem + au (mutually/each other).

6

アルゴリズムが市場の微細な変動に瞬時に適応し、取引を自動化する。

Algorithms instantaneously adapt to minute market fluctuations and automate trading.

Adverbial 'shunji ni' (instantaneously).

7

気候変動という地球規模の課題に対し、人類は生存を賭けた適応を迫られている。

Faced with the global challenge of climate change, humanity is being pressured to adapt for survival.

Passive voice 'semararete iru'.

8

哲学的観点から言えば、思考とは現実を認識し、それに適応するためのプロセスである。

From a philosophical perspective, thinking is the process of perceiving reality and adapting to it.

Tame no (for the purpose of) modifying a noun.

Colocações comuns

環境に適応する
社会に適応する
市場に適応する
柔軟に適応する
生物学的な適応
適応能力が高い
適応障害
制度に適応させる
完全に関係に適応する
適応を迫られる

Frases Comuns

郷に入っては郷に従え

— When in Rome, do as the Romans do. This is the classic idiom for adaptation.

郷に入っては郷に従えというように、現地のルールに適応しましょう。

適者生存

— Survival of the fittest. A core concept involving adaptation.

自然界は適者生存の世界であり、適応する者が生き残る。

空気を読む

— To read the air/atmosphere. A social form of 'tekioo'.

日本社会に適応するには、空気を読むことが必要だ。

臨機応変に

— Playing it by ear or responding flexibly to the situation.

臨機応変に状況に適応してください。

自己適応

— Self-adaptation. Often used in AI or personal growth.

このプログラムは自己適応機能を備えている。

適応プロセス

— The process of adaptation.

適応プロセスには数ヶ月かかることがあります。

適応戦略

— Adaptation strategy.

気候変動に対する適応戦略を立てる。

適応範囲

— The range of adaptation or compatibility.

この薬の適応範囲は広い。

社会適応

— Social adjustment.

子供の社会適応を支援する。

過剰適応

— Over-adaptation (trying too hard to fit in, leading to stress).

過剰適応はメンタルヘルスに悪影響を及ぼす。

Expressões idiomáticas

"水に慣れる"

— To get used to the 'water' (environment) of a place.

ようやくここの水に適応してきた。

Idiomatic
"身を任せる"

— To entrust oneself to the flow. A passive form of adaptation.

時代の流れに身を任せて適応する。

Poetic
"長いものには巻かれろ"

— If you can't beat them, join them. Adapting to power.

長いものには巻かれろの精神で、新しい上司に適応した。

Cynical
"虎の威を借る狐"

— A fox borrowing the tiger's authority. Adapting by using others.

彼は強い者に適応して生き残るのが上手い。

Critical
"変幻自在"

— Ever-changing and versatile. The ultimate state of adaptation.

彼は変幻自在にどんな状況にも適応できる。

Praiseworthy
"石の上にも三年"

— Three years on a stone (perseverance leads to adaptation).

石の上にも三年のつもりで適応を

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