てはいられない
Expresses that, given the circumstances, the speaker cannot afford to go on doing something or stay in a certain state any longer. It often conveys urgency or a feeling that one must act.
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Used in both speech and writing to express the speaker's own sense of urgency, often after a reason clause such as ので or から. わけにはいかない can also rest on social, moral or practical reasons, but it presents the matter as a reasoned judgment. This pattern foregrounds the speaker's feeling that the situation no longer lets them carry on as they are.
Learners sometimes confuse it with ないではいられない, which has the opposite sense of being unable to stop oneself from doing something.
Note that it expresses the speaker's felt urgency, not a rule or prohibition imposed by others as with てはならない.
Do not use it to describe a lack of ability; it concerns what circumstances allow, not what one is capable of.
- どころではないN2In its "have no room for" sense, どころではない is close to this pattern and often interchangeable, but it can follow nouns, verbs (in dictionary form), and adjectives and stresses an objective lack of leeway, whereas てはいられない only follows a verb's て-form. どころではない also has a degree sense of "far beyond just…"
- てばかりはいられないN2With the added ばかり, てばかりはいられない negates doing something exclusively: the action itself is still fine, you just can't do only that. With てはいられない, the action or state itself can no longer continue.
- ないではいられないN2ないではいられない follows the ない-form and means "can't help doing," so the action does end up happening, whereas てはいられない follows the て-form and means circumstances or feelings make it impossible to go on as before. The two are opposite in meaning and not interchangeable.
- てはならないN2てはならない expresses a prohibition based on rules or morals ("must not") and has a formal, rather written tone. てはいられない means pressing circumstances or impatience make it impossible to keep going, not a prohibition, so the two are not interchangeable.
- わけにはいかないN3わけにはいかない follows the dictionary form to say one can't do something because of reason, duty, or one's situation, and after the ない-form it means "must do." てはいられない follows the て-form and stresses that urgency or impatience make it impossible to carry on as before.
どころではない says circumstances rule an activity out entirely, and てばかりはいられない says one cannot keep doing only that one thing; ないではいられない means one cannot help doing something, and てはならない states a prohibition. わけにはいかない also says something cannot be done, for social, moral or practical reasons, but frames this as a reasoned judgment, whereas てはいられない voices the speaker's urgent feeling that they cannot stay in the current state.
