enemy

n.

1. A national or public opponent

   foe, attacker, antagonist, opponent, adversary, public enemy, criminal, opposition, fifth column, enemy within the gates, borer from within, saboteur, spy, foreign agent, assassin, murderer, betrayer, traitor, terrorist, revolutionary, seditionist, rebel, guerrilla(s), invader, the other side, hostile nation, hostile forces, villain, bad guy*.

   Antonyms ally, confederate, supporter*.

2. A personal opponent

   rival, opponent, competitor, foe, antagonist, adversary, assailant, nemesis, archenemy, bête noire (French), detractor, prosecutor, inquisitor, informer, calumniator, falsifier, disputant, traducer, asperser, defiler, defamer, slanderer, backbiter, vilifier.

   Antonyms friend*, supporter*, benefactor. See syn. study at opponent.opponent.