How to say "inconsistent" in Japanese

Choosing the right word
  • 不徹底ふてっていCommon
    na-adjective, nounCovers inconsistency in conduct or attitude, doing things halfway or failing to carry ideas through. It suggests lack of thoroughness, so it suits an inconsistent approach or policy. For 'inconsistent' in a purely logical sense, 不合理 is often better.
  • 不合理ふごうりCommon
    na-adjective, nounBest for the illogical or unreasonable sense of 'inconsistent', something that offends reason or makes no sense. It is really about irrationality or absurdity rather than wavering conduct, so it is seldom the word you want for inconsistent behavior.
    間違まちがいを一度いちども認みとめないというのは不合理ふごうりである。↗
    It's absurd never to admit your mistakes.
  • na-adjective, nounA mimetic word for things that are mismatched or do not fit together, giving the incoherent, patchy sense of 'inconsistent'. Suits accounts, outfits, or stories whose parts clash with each other.

Use 不徹底 for inconsistency between what one does and says or half-done effort, 不合理 for what defies reason or logic, and 「ちぐはぐ」 for mismatched, incoherent things that do not fit together.

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

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