行為(こうい)

こうい
noun
act, action, conduct
1. act, action, deed, conduct, behavior
A deliberate action or deed performed by a person, often used in formal or legal contexts.
違法(いほう)行為(こうい)は許(ゆる)されない。
Illegal acts are not permitted.
その行為(こうい)は法律(ほうりつ)に違反(いはん)する。
That act violates the law.
彼(かれ)の行為(こうい)は多(おお)くの人(ひと)を傷(きず)つけた。
His actions hurt many people.

行為(こうい) is a formal word for "act" or "action," commonly used in legal and official contexts.

WORD FORMATION:
行(こう) (go, do) + 為(い) (act, do) = act, deed

COMMON COMPOUNDS:

  • 違法(いほう)行為(こうい): illegal act
  • 犯罪(はんざい)行為(こうい): criminal act
  • 不法(ふほう)行為(こうい): unlawful act
  • 暴力(ぼうりょく)行為(こうい): act of violence
  • 性(せい)行為(こうい): sexual act
  • 自傷(じしょう)行為(こうい): self-harm
  • 背信(はいしん)行為(こうい): act of betrayal

SIMILAR WORDS:

  • 行動(こうどう): action, behavior (more general, everyday)
  • 振(ふ)る舞(ま)い: behavior, conduct
  • 所業(しょぎょう): deed, act (often negative)

NOTE:
行為(こうい) is more formal and often implies moral or legal judgment compared to 行動(こうどう).

general
Added 2026.2.4 22:51
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