The Collaborative International Dictionary of English v.0.48:

Enmity \En"mi*ty\, n.; pl. Enmities. [OE. enemyte, fr. enemy:
   cf. F. inimiti['e], OF. enemisti['e]. See Enemy, and cf.
   Amity.]
   1. The quality of being an enemy; hostile or unfriendly
      disposition.
      [1913 Webster]

            No ground of enmity between us known. --Milton.
      [1913 Webster]

   2. A state of opposition; hostility.
      [1913 Webster]

            The friendship of the world is enmity with God.
                                                  --James iv. 4.

   Syn: Rancor; hostility; hatred; aversion; antipathy;
        repugnance; animosity; ill will; malice; malevolence.
        See Animosity, Rancor.
        [1913 Webster]

WordNet (r) 3.0 (2006):

enmity
    n 1: a state of deep-seated ill-will [syn: hostility,
         enmity, antagonism]
    2: the feeling of a hostile person; "he could no longer contain
       his hostility" [syn: hostility, enmity, ill will]

Moby Thesaurus II by Grady Ward, 1.0:

116 Moby Thesaurus words for "enmity":
   Discordia, Eris, Kilkenny cats, abhorrence, abomination,
   alienation, allergy, altercation, animosity, animus, antagonism,
   antipathy, argument, aversion, bad blood, bickering, bitterness,
   cat-and-dog life, clash, clashing, cold sweat, collision, combat,
   competition, conflict, contention, contentiousness, contest,
   contestation, contrariety, contrariness, controversy,
   creeping flesh, cross-purposes, cut and thrust, daggers, dead set,
   debate, detestation, disaccord, disaffection, disaffinity, discord,
   discordance, discordancy, disgust, disharmony, dislike,
   disputation, dispute, dissension, estrangement, fighting,
   fractiousness, friction, gall, hate, hatred, horror, hostility,
   ill will, incompatibility, incompatibleness, inharmoniousness,
   inharmony, inimicalness, jangle, jar, litigation, loathing,
   logomachy, malevolence, malice, malignancy, malignity, mischief,
   mortal horror, nausea, negativeness, noncooperation, obstinacy,
   open conflict, oppugnancy, paper war, perverseness, polemic,
   quarrel, quarreling, quarrelsomeness, rancor, recalcitrance,
   refractoriness, repugnance, repulsion, rivalry, rub, scrapping,
   shuddering, spite, spleen, squabbling, strained relations, strife,
   struggle, tension, uncooperativeness, uncordiality, unfriendliness,
   unharmoniousness, unpleasantness, vying, war, war of words,
   warfare, words, wrangling



Easton's 1897 Bible Dictionary:

Enmity
   deep-rooted hatred. "I will put enmity between thee and the
   woman, between thy seed and her seed" (Gen. 3:15). The
   friendship of the world is "enmity with God" (James 4:4; 1 John
   2:15, 16). The "carnal mind" is "enmity against God" (Rom. 8:7).
   By the abrogation of the Mosaic institutes the "enmity" between
   Jew and Gentile is removed. They are reconciled, are "made one"
   (Eph. 2:15, 16).