Adversary :: Adversary (n.) One who is turned against another or others with a design to oppose or resist them; a member of an opposing or hostile party; an opponent; an antagonist; an enemy; a foe.
Adversary :: Adversary (a.) Having an opposing party; not unopposed; as, an adversary suit..
Adversative :: Adversative (a.) Expressing contrariety, opposition, or antithesis; as, an adversative conjunction (but, however, yet, etc. ); an adversative force..