I-adjective (keiyoushi)
can't be helped (of situation, reason, etc.); unavoidable
Usually written using kana alone
よんどころない事情で、今年の夏は別荘で過ごせないんだ。Due to unavoidable circumstances this summer I can't stay in my holiday cottage.
Also written 拠無い【よんどころない】、拠ん所無い【よんどころない】