Webster's Revised Unabridged Dictionary · 1913

Adversary

Adversary ({not transcribed}) , noun

[Old English adversarie, direct from the Latin, and adversaire, from Old French adversier, aversier, from Latin adversarius (a.) turned toward, (n.) an adversary. See Adverse.]

One who is turned against another or others with a design to oppose<-- p. 26 --> or resist them; a member of an opposing or hostile party; an opponent; an antagonist; an enemy; a foe.
His ancient knot of dangerous adversaries. — Shakespeare
Agree with thine adversary quickly. — Matt. v. 25
It may be thought that to vindicate the permanency of truth is to dispute without an adversary. — Beattie
Collocations (1)
The Adversary , The Satan, or the Devil.

Adversary ({not transcribed}) , adjective

1.
Opposed; opposite; adverse; antagonistic. [Archaic] — Bp. King
2.
(Law) Having an opposing party; not unopposed; as, an adversary suit.