How to say "suitability" in Japanese

Choosing the right word
  • 適性てきせいJLPT N1approx.Common
    nounCovers suitability in the sense of fitness or aptness for a role, task, or purpose — whether someone or something is well suited to it. Typical when discussing a person's aptitude for a job or field of study.
    天才てんさいとは忍耐にんたいに堪こらえ得える偉大いだいな適性てきせいに外そとならぬ。↗
    Genius is nothing but a great aptitude for patience.
  • 良し悪しよしあしJLPT N1approx.Common
    nounCovers suitability as judged quality: whether a thing is good or bad, right or wrong, appropriate or not. It frames suitability as an evaluation of merits and drawbacks, typically in assessing options, plans, or conduct.
    この女の子おんなのこはまだ小ちいさくてもののよしあしがわからない。↗
    The girl is not old enough to be responsible.
  • 対応たいおうJLPT N1approx.Common
    noun, suru verb, intransitive verbIts primary senses are coordination, matching, and correspondence; suitability appears only as being appropriate for something. For plain 'suitability' it is seldom the word you want — reach for it when matching or correspondence is meant.
    われわれは教育きょういくの方法ほうほうを時代じだいに対応たいおうしなければならない。↗
    We have to bring our teaching methods up to date.

Use 適性 for fitness or aptness of a person or thing for a purpose, 「良し悪し」 for judging whether something is good or bad, and 対応 mainly for matching or correspondence rather than suitability itself.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese equivalents
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JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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