godan verb (-u), intransitive verb
Almost always used in negative constructions (e.g., 敵わない) to mean 'cannot match' or 'is no match for'. Describes being unable to compete with or equal someone or something in ability, strength, or quality.
彼には敵わない。
I'm no match for him.
この暑さには敵わない。
I can't stand this heat.