Grammar Info
N1 Lesson 10: 8/22

ずには措（お）かない
will definitely, will certainly, bound to, not fail to

also used to express that subject (usually non-animate like a book) has an emotional effect on people

Structure
Verb [ない-stem] + ずには + おかない
Verb [ない] + では + おかない
Exception:

する→せずにはおかない
Verb [Negative] + では + おかない
Structure Legend  
Details
Register Standard
使用域 一般
Information
  • (A) ずにはおかない is a phrase used when a subject (person or organization, usually speaker herself/himself) has a strong resolution to exert influence over someone. Often used with the causative form, adverbs like きっと, 絶対に or 必ず can be added for emphasis.
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《小説（しょうせつ）、勇者（ゆうしゃ）》「どんな手段（しゅだん）を用（もち）いても、かならず魔王（まおう）を倒（たお）さずにはおかない。」
Novel: "No matter what it takes, I will not fail to defeat the Demon Lord!"
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    • 「私（わたし）はきっと彼（かれ）に同（おな）じ手（て）で仕返（しかえ）しをしないではおかない。」
    "I won't fail to pay him back in his own coin."
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    • 「警察（けいさつ）はすべての悪者（わるもの）に必（かなら）ず罰（ばち）を与（あた）えずにはおかない。」
    "The police will not fail to punish all the wicked people."
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