Merriam-Webster Online Dictionary
enemy (noun)1.
one that is antagonistic to another , especially one seeking to injure, overthrow, or confound an opponent
2.
something harmful or deadly - alcohol was his greatest enemy
3.
a) a military adversary
b) a hostile unit or force
Merriam-Webster Online Thesaurus
enemy (noun)one that is hostile toward another
SYNONIMS:
adversary, antagonist, foe, hostile, opponentRELATED WORDS:
archenemy, archfoe, nemesis; ill-wisher; bane, bête noire; assailant, attacker, combatant, invader; competitor, emulator, rivalNEAR ANTONYMS:
buddy, chum, compadre, crony, fellow, hail-fellow, hail-fellow-well-met, hearty, hobnobber, mate, musketeer, pal; abettor ( abetter), accomplice, ally, collaborator, colleague, comrade, confederate, friendly, partner; adherent, disciple, follower; backer, benefactor, exponent, supporter, sympathizer, well-wisher