〜ずじまい zu jimai
〜ずじまい（zu jimai）means “ended up not doing … (and regret it)”. Expresses that something one intended or wanted to do ended up never getting done, usually with a feeling of regret or disappointment about the missed chance. Formation: V-ない（ないを取る）+ ずじまい ／ する → せずじまい
ended up not doing … (and regret it)
N2Formation
V-ない（ないを取る）+ ずじまい ／ する → せずじまい
Explanation
Expresses that something one intended or wanted to do ended up never getting done, usually with a feeling of regret or disappointment about the missed chance.
Examples
Note
Always carries regret over a chance lost — you can't use it for things you simply chose not to do. する becomes せずじまい (not しずじまい).
FAQ
〜ずじまい — what does it mean and how is it used?
ended up not doing … (and regret it). Expresses that something one intended or wanted to do ended up never getting done, usually with a feeling of regret or disappointment about the missed chance.
〜ずじまい — how do you form it?
V-ない（ないを取る）+ ずじまい ／ する → せずじまい
〜ずじまい — any usage notes?
Always carries regret over a chance lost — you can't use it for things you simply chose not to do. する becomes せずじまい (not しずじまい).