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LingakuLingakuVariant: ないわけにはいかない may also appear as ないわけにはいかない / ないわけにもいかない
The grammar pattern ないわけにはいかない expresses that one cannot avoid doing something – there is no way to not do it. It conveys a sense of obligation or inevitability driven by social expectations, moral duty, responsibility, or circumstances. It is often translated as "can't not do," "have no choice but to do," or "must do."
This pattern uses the negative form of a verb combined with わけにはいかない, which literally means "there is no reason/way to not do ~." The double negative creates a strong affirmative meaning: you must do it.
Unlike simple obligation expressions like 〜～なければならない (must do), ないわけにはいかない carries a stronger nuance that external factors – such as social pressure, common sense, or one's position – make it impossible to avoid the action. The speaker may not necessarily want to do it, but feels compelled by circumstances.
Be careful not to confuse this with the affirmative pattern V[plain] + わけにはいかない, which means "cannot do ~" (it's not acceptable to do something). The negative version ないわけにはいかない flips the meaning to "cannot not do ~."
Attach わけにはいかない to the ない form of the verb:
The polite form is ないわけにはいきません.