Source : Webster's Revised Unabridged Dictionary (1913)

Enemy \En"e*my\, a.
   Hostile; inimical. [Obs.]

         They . . . every day grow more enemy to God. --Jer.
                                                  Taylor.

Enemy \En"e*my\, n.; pl. {Enemies}. [OF. enemi, F. ennemi, from
   L. inimicus; in- (negative) + amicus friend. See {Amicable}.]
   One hostile to another; one who hates, and desires or
   attempts the injury of, another; a foe; an adversary; as, an
   enemy of or to a person; an enemy to truth, or to falsehood.

         To all good he enemy was still.          --Spenser.

         I say unto you, Love your enemies.       --Matt. v. 44.

   {The enemy} (Mil.), the hostile force. In this sense it is
      construed with the verb and pronoun either in the singular
      or the plural, but more commonly in the singular; as, we
      have met the enemy and he is ours or they are ours.

            It was difficult in such a country to track the
            enemy. It was impossible to drive him to bay.
                                                  --Macaulay.

   Syn: Foe; antagonist; opponent. See {Adversary}.

Source : WordNet®

enemy
     n 1: an opposing military force; "the enemy attacked at dawn"
     2: an armed adversary (especially a member of an opposing
        military force); "a soldier must be prepared to kill his
        enemies" [syn: {foe}, {foeman}, {opposition}]
     3: any hostile group of people; "he viewed lawyers as the real
        enemy"
     4: a personal enemy; "they had been political foes for years"
        [syn: {foe}] [ant: {ally}]