Meaning & usage
ないことには expresses that a desired result cannot happen unless a certain action is done first, as in 休まないことには or 食べてみないことには. It attaches to the full negative nai-form of a verb, followed by ことには, and the main clause that follows is almost always negative. The pattern stresses a necessary precondition rather than a general if. It is common in spoken and written Japanese for giving reasons or strong advice.
Example sentences 6
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うちのお姉ちゃんさぁ、星占いを見ないことには一日が始まらないのよ。
My sister can't start the day without reading her horoscope.
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手伝ってもらわないことには、この火は消せない! こっちに来て手伝って!
I cannot put this fire out without help! Come to help me!
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お前と俺は、今回のプロジェクトでは車の両輪ということだろう。仲良くしないことにはうまくいかないよ。
It seems you and I are essential to this project. We'd better get along or it'll go badly.
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実際に聞かないことには決められない。
I can't decide unless I actually ask.
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食べてみないことには味は分からない。
You won't know the taste unless you try it.
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休まないことには風邪は治らないよ。
Your cold won't get better unless you rest.
In past JLPT papers
This came up in 3 past exam questions.