Grammar Info
N3 Lesson 6: 16/24

訳(わけ)には行(い)かない
cannot afford to, no way・impossible to do

Structure
Casual
Formal
Verb + わけにはいかない
Verb + わけにはいきません
Details
Register Standard
使用域 一般
Information
わけにはいかない is a statement that combines わけ ‘to be so’, ‘reason’, or ‘cause’, with the 格助詞(かくじょし) (case marking particle) , the 副助詞(ふくじょし) (adverbial particle) は, and the ‘cannot go’ meaning of 行(い)かない. It can be translated as ‘cannot afford to (A)’, or ‘impossible to (A)’. However, the literal meaning is much closer to ‘it cannot be so that (A)’.
This structure will be used directly after the non-past form of verbs, in order to highlight them as being either highly undesirable, or highly unattainable.
  • この料理(りょうり)は妻(つま)頑張(がんば)って作(つ)ってくれたやつだから不味(まず)くても食(た)べないわけにはいかない
    My wife made this food for me, so no matter how bad it tastes, it cannot be so that I won’t eat it.
  • 明日(あした)は人手(ひとで)足(た)りないから、休(やす)むわけにはいかない
    Since we are short-handed tomorrow, I cannot afford to take a day off.
Although わけにはいかない primarily highlights things that ar undesirable, it may also highlight something that is desirable, but impossible for some reason. This will depend largely on the speaker’s tone of voice, and context of the conversation.
  • このジャケットが欲(ほ)しいけど、今月(こんげつ)はお金(かね)使(つか)い過(す)ぎたから買(か)うわけにはいかない
    I want this Jacket, but because I spent too much money this month, it cannot be so that I buy it.
  • 先輩(せんぱい)誘(さそ)われたから、断(ことわ)るわけにはいかない
    I was invited by my senpai, so there is no way that I can decline the offer. In these types of sentences, the expression is quite similar to the ‘I guess it’s just not meant to be so’ nuance that can be conveyed in English, highlighting regret.
Slow Male
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僕(ぼく)その問題(もんだい)を黙(だま)って見(み)過(す)ごすわけにはいかない
I cannot afford to silently overlook that problem.
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大統領(だいとうりょう)に頼(たの)まれたので断(ことわ)るわけにはいかない
Since I was asked by the president I can't afford to say no.
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前回(ぜんかい)の日本語(にほんご)能力(のうりょく)試験(しけん)に不(ふ)合格(ごうかく)だったので、次(つぎ)は失敗(しっぱい)するわけにはいかない
I failed the JLPT last time, so I cannot afford to fail it a second time.
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Books
Tae Kim's Japanese Grammar Guide
Page 286
[AIAIJ] An Integrated Approach to Intermediate Japanese
Page 93