How to say "involuntary" in Japanese

• 不本意ふほんいCommon
  na-adjective, nounCovers 'involuntary' in the sense of against one's wishes: it stresses reluctance or regret, as in an involuntary transfer or resignation; it concerns what one wants, not automatic bodily reactions.
  彼女かのじょは不本意ふほんいながらもそうした。↗

  She did it against her will.
• 無意識むいしきCommon
  na-adjective, no-adjectiveCovers 'involuntary' in the sense of automatic: actions performed without conscious thought or control, such as reflexive bodily movements; it does not express reluctance over a decision or outcome.
  お母かあさんは無意識むいしきに椅子いすをつかんだ。↗

  Unconsciously my mom took hold of the chair.

Choose 不本意 for 'involuntary' meaning against a person's wishes, as in an unwanted decision or outcome, and 無意識 for actions that happen without conscious control, such as automatic bodily movements.

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

• 不本意ふほんいreluctant
• 不随意ふずいいinvoluntary
• 無意志むいしnon-volitional
• 無意識むいしきunconscious