えない

-えない【-得ない】

〔(「…せざるをえない」の形で)不可避である〕 have to do; be obliged to do; cannot avoid doing; have no choice but to do.

●その計画は断念せざるをえなかった. We had no choice but to drop the plan. | There was nothing we could do except [for it but to] abandon the project.