知しらぬ間まに

expression

before one knows it; without noticing; unawares

Describes something happening or changing while one is unaware, often with a nuance of surprise or inevitability. Synonymous with 知らない間に.

See also: 知らない間に

• 知しらぬ間まに雨あめが降ふり出だしていた。

  It had started raining before I knew it.

• 知しらぬ間まに彼かれは部屋へやを出でて行いった。

  He left the room without my noticing.