〜ずにはすまない

Formation

N1LimitationFormal/StiffBusinessLaw
ない-Form
Verb
ずにはすまない,
ない-Form
Verb
ではすまない
Variations
ではすまない
ずには済まない
では済まない

Meaning

Indicates that one must perform a certain action due to the circumstances, social common sense, or feelings of obligation. It implies that failing to do so would be unacceptable or unforgivable.

Examples

これだけの損害を与えたのだから、謝らずにはすまない。

Since I've caused this much damage, I must apologize.

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Conjugation Reference