foe

from WordNet (r) 3.0 (2006)

foe
    n 1: an armed adversary (especially a member of an opposing
         military force); "a soldier must be prepared to kill his
         enemies" [syn: {enemy}, {foe}, {foeman}, {opposition}]
    2: a personal enemy; "they had been political foes for years"
       [syn: {foe}, {enemy}] [ant: {ally}, {friend}]

from The Collaborative International Dictionary of English v.0.48

Foe \Foe\ (f[=o]), n. [OE. fo, fa, AS. f[=a]h hostile; prob.
   akin to E. fiend. [root]81. See {Fiend}, and cf. {Feud} a
   quarrel.]
   [1913 Webster]
   1. One who entertains personal enmity, hatred, grudge, or
      malice, against another; an enemy.
      [1913 Webster]

            A man's foes shall be they of his own household.
                                                  --Matt. x. 36
      [1913 Webster]

   2. An enemy in war; a hostile army.
      [1913 Webster]

   3. One who opposes on principle; an opponent; an adversary;
      an ill-wisher; as, a foe to religion.
      [1913 Webster]

            A foe to received doctrines.          --I. Watts
      [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Foe \Foe\, v. t.
   To treat as an enemy. [Obs.] --Spenser.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

18 Moby Thesaurus words for "foe":
      adversary, antagonist, archenemy, assailant, bitter enemy,
      combatant, devil, enemy, foeman, muddlement, open enemy, opponent,
      opposing party, opposite camp, public enemy, sworn enemy,
      the loyal opposition, the opposition