adverbial N2 common casualpolitewritten
いつの間にか — before one knows it
いつの間にか ・ いつのまにか
Meaning
- before one knows it / without noticing / somewhere along the way — a change happened unnoticed
Key sentence
いつの間にか日が暮れていた。
Before I knew it, the sun had set.
Usage
Describes noticing, after the fact, that a state has changed — usually with a 〜ていた / 〜ている result.
Examples
いつの間にか子どもたちは大きくなっていた。
Before I knew it, the kids had grown up.
いつの間にか雨がやんでいた。
At some point, without my noticing, the rain had stopped.
Easily confused with
See いつの間にか in real sentences
Jengo shows いつの間にか the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled from published Japanese grammar references.