N1 Lesson 10: 1/8
せずにはすまない 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 ざろをえない or ないわけにはいかない or similar grammar points instead as this expression is not very common.

Structure Legend
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
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(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)わないでは済(す)まない
Audio coming soon!
It's an important meeting, so I won't get away without making it on time.

Try N1 : Page 164
Shin Kanzen Master N1 Bunpou : Page 88
Sou Matome Bunpou N1 : Page 78