The Collaborative International Dictionary of English v.0.48:

Antipathy \An*tip"a*thy\, n.; pl. Antipathies. [L. antipathia,
   Gr. ?; 'anti` against + ? to suffer. Cf. F. antipathie. See
   Pathos.]
   1. Contrariety or opposition in feeling; settled aversion or
      dislike; repugnance; distaste.
      [1913 Webster]

            Inveterate antipathies against particular nations,
            and passionate attachments to others, are to be
            avoided.                              --Washington.
      [1913 Webster]

   2. Natural contrariety; incompatibility; repugnancy of
      qualities; as, oil and water have antipathy.
      [1913 Webster]

            A habit is generated of thinking that a natural
            antipathy exists between hope and reason. --I.
                                                  Taylor.
      [1913 Webster]

   Note: Antipathy is opposed to sympathy. It is followed by
         to, against, or between; also sometimes by for.
         [1913 Webster]

   Syn: Hatred; aversion; dislike; disgust; distaste; enmity;
        ill will; repugnance; contrariety; opposition. See
        Dislike.
        [1913 Webster]

WordNet (r) 3.0 (2006):

antipathy
    n 1: a feeling of intense dislike [syn: antipathy, aversion,
         distaste]
    2: the object of a feeling of intense aversion; something to be
       avoided; "cats were his greatest antipathy"

The Devil's Dictionary (1881-1906):

ANTIPATHY, n.  The sentiment inspired by one's friend's friend.