adversary
Cross references: 1. opponent ad.ver.sary \'ad-v*(r)-.ser-e-\ n : one that contends with, opposes, or resists : ENEMY
Webster's English DictionaryCross references: 1. opponent ad.ver.sary \'ad-v*(r)-.ser-e-\ n : one that contends with, opposes, or resists : ENEMY