An adverb meaning unavoidably or inevitably; used when something must be done or occurs reluctantly or by necessity (often formal).
急病のため、やむえず会議を欠席した。
Due to a sudden illness, I had to (unavoidably) be absent from the meeting.
取引先の都合でやむえず納期を延ばしてもらった。
Because of the client's circumstances, we had no choice but to ask to extend the deadline.
反対が多く、やむえず計画を中止した。
There was much opposition, so the plan was inevitably cancelled.