Grammar Info
N1 Lesson 10: 1/12
せずにはすまない せずにはすまない Won't get away without, Won't get off without, Have to, Have no choice but to, Can’t not It is advisable to use ざるをえない or ないわけにはいかない or similar grammar points instead as this expression is not very common.
Structure
Verb[ない] + ずには + すまない
Verb[ない] + では + すまない

Exception:
する→せずにはすまない
Details
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使用域 タメ語
Information
  • (A) ずにはすまない is a formal written phrase, literally meaning that someone is "not going to get away without (A)". It is used when someone has to do something due to social norms, laws or customs. Reason for doing (A) is usually negatiive in some way.
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重要(じゅうよう)な会議(かいぎ)だから、間(ま)に合(あ)わないではすまない
It's an important meeting, so I won't get away without making it on time.
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