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せずにはいられなかった

couldn't help but; couldn't stop oneself from

→ 為る
phrase Rare #45,773
couldn't help but; couldn't stop oneself from Follows the ず form of a verb. The past-tense form expresses being unable to resist doing something.
JA: 彼の勇気に感心せずにはいられなかった。
EN: I couldn't help admiring his courage.

彼の勇気に感心せずにはいられなかった。

I couldn't help but admire his courage.

彼女は娘のことを心配せずにはいられなかった。

She couldn't help but worry about her daughter.

彼女は息子のことを心配せずにはいられなかった。

She couldn't help worrying about her son.