せずに
sezuni

Adverb

1. without (doing); instead of

その事故じこ両親りょうしんくした少女しょうじょ同情どうじょうせずにはいられなかった。
sono jikode ryōshin'o nakushita shōjoni dōjō sezuniwa irarenakatta.
I couldn't but sympathize with the girl who had lost her parents in the accident.