The Collaborative International Dictionary of English v.0.48:

Disgusting \Dis*gust"ing\, a.
   That causes disgust; sickening; offensive; revolting. --
   Dis*gust"ing*ly, adv.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Disgust \Dis*gust"\, v. t. [imp. & p. p. Disgusted; p. pr. &
   vb. n. Disgusting.] [OF. desgouster, F. d['e]go[^u]ter;
   pref. des- (L. dis-) + gouster to taste, F. go[^u]ter, fr. L.
   gustare, fr. gustus taste. See Gust to taste.]
   To provoke disgust or strong distaste in; to cause (any one)
   loathing, as of the stomach; to excite aversion in; to offend
   the moral taste of; -- often with at, with, or by.
   [1913 Webster]

         To disgust him with the world and its vanities.
                                                  --Prescott.
   [1913 Webster]

         [AE]rius is expressly declared . . . to have been
         disgusted at failing.                    --J. H.
                                                  Newman.
   [1913 Webster]

         Alarmed and disgusted by the proceedings of the
         convention.                              --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

disgusting
    adj 1: highly offensive; arousing aversion or disgust; "a
           disgusting smell"; "distasteful language"; "a loathsome
           disease"; "the idea of eating meat is repellent to me";
           "revolting food"; "a wicked stench" [syn: disgusting,
           disgustful, distasteful, foul, loathly,
           loathsome, repellent, repellant, repelling,
           revolting, skanky, wicked, yucky]

Moby Thesaurus II by Grady Ward, 1.0:

143 Moby Thesaurus words for "disgusting":
   abhorrent, abject, abominable, arrant, atrocious, awful, barfy,
   base, beastly, beggarly, below contempt, beneath contempt,
   blameworthy, brutal, cheesy, contemptible, crappy, crude, crummy,
   debased, degraded, deplorable, depraved, despicable, detestable,
   dire, dirty, distasteful, dreadful, egregious, enormous, execrable,
   fecal, feculent, fetid, filthy, flagrant, flyblown, forbidding,
   foul, fulsome, gloppy, grave, grievous, gross, gunky, hateful,
   heinous, horrible, horrid, icky, ignoble, infamous, lamentable,
   little, loathsome, lousy, low, low-down, lumpen, maggoty,
   malodorous, mangy, mean, measly, mephitic, miasmal, miasmic,
   miserable, monstrous, mucky, nasty, nauseating, nefarious, noisome,
   notorious, noxious, objectionable, obnoxious, obscene, odious,
   offensive, ordurous, outrageous, paltry, petty, pitiable, pitiful,
   poky, poor, puky, putrid, rank, rebarbative, regrettable,
   repellent, reprehensible, reptilian, repugnant, repulsive,
   revolting, rotten, sad, scabby, scandalous, schlock, scrubby,
   scruffy, scummy, scurfy, scurvy, shabby, shameful, shitty,
   shocking, shoddy, sickening, slabby, slimy, sloppy, sloshy, sludgy,
   slushy, small, sordid, sposhy, squalid, stinking, terrible,
   too bad, unappetizing, unclean, unmentionable, unsavory, vile,
   villainous, vomity, woeful, wormy, worst, worthless, wretched,
   yecchy