cannot be helped; unavoidable; inevitable—used when there is no other reasonable choice because of circumstances.
台風で電車が止まったので、遅刻はやむを得ない。
Because the trains stopped due to the typhoon, being late cannot be helped.
事情が事情だから、契約を解除するのはやむを得ない決定だった。
Given the circumstances, canceling the contract was an unavoidable decision.
急な体調不良で当日欠席するのはやむを得ない。
It's unavoidable to miss the event on the day due to sudden illness.