ずにはいられない

expression, i-adjective

can't help but do; feel compelled to

Attaches to the negative stem of a verb (V-ず) to express an irresistible urge or emotional compulsion. Often used for feelings, reactions, or actions one cannot suppress. Similar to ないではいられない.

See also: ないではいられない

• その話はなしを聞きいて、笑わらわずにはいられなかった。

  Hearing that story, I couldn't help but laugh.

• 彼かれの演えん奏そうに感かん動どうせずにはいられなかった。

  I couldn't help but be moved by his performance.