adverb
in the end; finally; after all
Expresses that something happens as a final result or conclusion, often after a process or delay. Similar to 結局 but slightly more colloquial.
色々考えたけど、しまいに最初の案に戻った。
I thought about many things, but in the end I went back to the first idea.
彼はしまいに謝った。
He finally apologized.
Derived from the noun しまい (end, conclusion) + particle に, functioning adverbially. The kanji 仕舞 is ateji.