How to say "incompatible" in Japanese

• 非対応ひたいおう
  no-adjectiveCovers incompatibility in the sense of not being supported, typically of software, formats, or devices. A natural way to say something is incompatible with a particular system or version.
• 油に水あぶらにみず
  expressionAn idiomatic expression describing people or things that mix as poorly as oil and water; it paints an incompatible pair vividly rather than naming a technical incompatibility. Seldom the word you want outside such figurative contexts.
• 相容れないあいいれない
  expression, i-adjectiveFor people, ideas, or positions that are in fundamental conflict and cannot coexist or be reconciled. This is the choice when 'incompatible' means mutually hostile or irreconcilable rather than technically unmatched.
  我々われわれの利益りえきは彼かれらの利益りえきと相あい容いれない。↗

  Our interests clash with theirs.
• 不適合ふてきごう
  noun, na-adjectiveFormal term for non-conformity or noncompliance, e.g. something failing to meet a required standard or specification. Use it when 'incompatible' really means 'does not conform'; as a rendering of 'incompatible' it is marginal.
• 対応不可たいおうふか
  no-adjectiveSpecifically for devices or equipment that are incompatible or unsupported, as in a message stating that a device cannot be handled. The clearest choice when 'incompatible (e.g. device)' is the sense you need.

For technical or device contexts choose 対応不可 or 非対応, for formal non-conformity use 不適合, for people or ideas in fundamental conflict use 「相容れない」, and 「油に水」 is an idiom for ill-matched pairs.

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

• 非対応ひたいおうincompatible
• 油に水あぶらにみずincompatible
• 相容れないあいいれないin conflict
• 不適合ふてきごうnon-conforming process
• 対応不可たいおうふかincompatible (e.g. device)