The Collaborative International Dictionary of English v.0.48:

Fetid \Fet"id\ (? or ?; 277), a. [L. fetidus, foetidus, fr.
   fetere, foetere, to have an ill smell, to stink: cf. F.
   f['e]tide.]
   Having an offensive smell; stinking.
   [1913 Webster]

         Most putrefactions . . . smell either fetid or moldy.
                                                  --Bacon.
   [1913 Webster]

WordNet (r) 3.0 (2006):

fetid
    adj 1: offensively malodorous; "a foul odor"; "the kitchen
           smelled really funky" [syn: fetid, foetid, foul,
           foul-smelling, funky, noisome, smelly,
           stinking, ill-scented]

Moby Thesaurus II by Grady Ward, 1.0:

155 Moby Thesaurus words for "fetid":
   abhorrent, abominable, arrant, atrocious, awful, bad, bad-smelling,
   barfy, base, beastly, below contempt, beneath contempt,
   blameworthy, brackish, brutal, cloying, contemptible, crappy,
   crude, deplorable, despicable, detestable, dire, disgusting,
   dreadful, egregious, enormous, execrable, fecal, feculent, filthy,
   flagrant, flyblown, forbidding, foul, frowsty, frowy, frowzy,
   fulsome, funky, fusty, gamy, gloppy, graveolent, grievous, gross,
   gunky, hateful, heinous, high, horrible, horrid, icky, ignoble,
   ill-smelling, infamous, lamentable, loathsome, lousy, maggoty,
   malodorous, mawkish, mephitic, miasmal, miasmic, mildewed, mildewy,
   moldy, monstrous, mucky, musty, nasty, nauseant, nauseating,
   nauseous, nefarious, nidorous, noisome, notorious, noxious,
   objectionable, obnoxious, obscene, odious, odorous, offensive,
   olid, ordurous, outrageous, overripe, pitiable, pitiful, poisonous,
   puky, putrid, rancid, rank, reasty, reasy, rebarbative, reechy,
   reeking, reeky, regrettable, repellent, reprehensible, repugnant,
   repulsive, revolting, rotten, sad, scabby, scandalous, schlock,
   scummy, scurfy, scurvy, shabby, shameful, shitty, shocking, shoddy,
   sickening, slabby, slimy, sloppy, sloshy, sludgy, slushy, smellful,
   smelling, smelly, sordid, spoiled, sposhy, squalid, stenchy,
   stinking, strong, stuffy, sulfurous, terrible, too bad, unclean,
   vile, villainous, vomity, weevily, woeful, wormy, worst, worthless,
   wretched, yecchy, yucky