Verb ない form (drop ない) + ずじまい

[Ended up not doing]

Connection: Verb ない stem + ずじまい (する → せずじまい)

Usage: Expresses that something one intended or wanted to do was ultimately never accomplished. Carries a feeling of regret or disappointment that the action was left undone.

Nuance: Stronger sense of regret than simply using なかった. Implies the speaker had the intention but circumstances prevented it.

Examples:

せっかく京都に行ったのに、金閣寺は見ずじまいだった。(Even though I went all the way to Kyoto, I ended up not seeing Kinkakuji.)

借りた本を読まずじまいで返してしまった。(I returned the borrowed book without ever reading it.)

言いたいことがあったが、結局言わずじまいに終わった。(I had something I wanted to say, but in the end I never said it.)