The Collaborative International Dictionary of English v.0.48:

Ill-will \Ill`-will"\
   See under Ill, a.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "ill-will":
   acrimony, animosity, animus, bad blood, bad temper, bad will,
   bitter feeling, bitterness, blighting glance, despite,
   evil disposition, evil eye, feud, grudge, hard feelings, hostility,
   ill blood, ill feeling, ill nature, ill-disposedness, malevolence,
   maliciousness, malignancy, malignity, malocchio, rancor, soreness,
   sourness, spite, spitefulness, spleen, vendetta, venom, virulence,
   vitriol, whammy