The Collaborative International Dictionary of English v.0.48:

Nauseate \Nau"se*ate\, v. i. [imp. & p. p. Nauseated; p. pr. &
   vb. n. Nauseating.] [L. nauseare, nauseatum, fr. nausea.
   See Nausea.]
   To become squeamish; to feel nausea; to turn away with
   disgust.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nauseating
    adj 1: causing or able to cause nausea; "a nauseating smell";
           "nauseous offal"; "a sickening stench" [syn:
           nauseating, nauseous, noisome, queasy,
           loathsome, offensive, sickening, vile]

Moby Thesaurus II by Grady Ward, 1.0:

84 Moby Thesaurus words for "nauseating":
   abhorrent, abominable, bad, barfy, base, beastly, below contempt,
   beneath contempt, brackish, cloying, contemptible, crappy, crude,
   despicable, detestable, disgusting, execrable, fecal, feculent,
   fetid, filthy, flyblown, forbidding, foul, fulsome, gloppy, gross,
   gunky, hateful, heinous, high, icky, ignoble, loathsome, maggoty,
   malodorous, mawkish, mephitic, miasmal, miasmic, mucky, nasty,
   nauseant, nauseous, noisome, noxious, objectionable, obnoxious,
   obscene, odious, offensive, ordurous, overripe, poisonous, puky,
   putrid, rancid, rank, rebarbative, repellent, repugnant, repulsive,
   revolting, rotten, scabby, scummy, scurfy, shitty, sickening,
   slabby, slimy, sloppy, sloshy, sludgy, slushy, spoiled, sposhy,
   stinking, vile, vomity, weevily, wormy, yecchy, yucky