WordNet (r) 3.0 (2006):

rebarbative
    adj 1: serving or tending to repel; "he became rebarbative and
           prickly and spiteful"; "I find his obsequiousness
           repellent" [syn: rebarbative, repellent, repellant]

Moby Thesaurus II by Grady Ward, 1.0:

60 Moby Thesaurus words for "rebarbative":
   abhorrent, abominable, bad, barfy, base, beastly, below contempt,
   beneath contempt, brackish, cloying, contemptible, crude,
   despicable, detestable, disgusting, execrable, fetid, forbidding,
   foul, fulsome, gross, hateful, heinous, high, icky, ignoble,
   loathsome, maggoty, malodorous, mawkish, mephitic, miasmal,
   miasmic, nasty, nauseant, nauseating, nauseous, noisome, noxious,
   objectionable, obnoxious, obscene, odious, offensive, overripe,
   poisonous, rancid, rank, repellent, repugnant, repulsive,
   revolting, rotten, sickening, spoiled, stinking, vile, vomity,
   weevily, yucky