What it means
てはいられない expresses that someone cannot continue doing something in the current situation, usually because circumstances require a change or immediate action. It often conveys urgency, determination, or the realization that remaining in the same state is no longer possible. The subject is frequently omitted when it is clear from context.
Usage note
Do not confuse てはいられない with てはいけない. てはいけない means that an action is prohibited, whereas てはいられない means that continuing the action is impossible, impractical, or unacceptable under the circumstances.
How to use it
Verb (て-form)はいられません
このまま待ってはいられません。
I cannot keep waiting like this.
Verb (て-form)はいられない
このまま待ってはいられない。
I cannot keep waiting like this.