'Adversary' definitions:

Definition of 'adversary'

From: WordNet
noun
Someone who offers opposition [syn: adversary, antagonist, opponent, opposer, resister] [ant: agonist]

Definition of 'Adversary'

From: Easton
  • Adversary (Heb. satan), an opponent or foe (1 Kings 5:4; 11:14, 23, 25; Luke 13:17); one that speaks against another, a complainant (Matt. 5:25; Luke 12:58); an enemy (Luke 18:3), and specially the devil (1 Pet. 5:8).