The Collaborative International Dictionary of English v.0.48:

malodorous \mal*o"dor*ous\, a.
   Offensive to the sense of smell; ill-smelling. --
   mal*o"dor*ous*ness. n. --Carlyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

malodorous
    adj 1: having an unpleasant smell [syn: malodorous,
           malodourous, unpleasant-smelling, ill-smelling,
           stinky] [ant: fragrant]

Moby Thesaurus II by Grady Ward, 1.0:

137 Moby Thesaurus words for "malodorous":
   abhorrent, abominable, aromatic, bad, bad-smelling, barfy, base,
   beastly, below contempt, beneath contempt, contemptible, crappy,
   crude, decayed, decomposed, despicable, detestable, disgusting,
   effluvious, execrable, fecal, feculent, fetid, filthy, flyblown,
   forbidding, foul, fragrant, frowsty, frowsy, frowy, frowzy,
   fulsome, funky, fusty, gamy, gloppy, graveolent, gross, gunky,
   hateful, heinous, high, icky, ignoble, ill-smelling, ill-treat,
   ill-use, improper, indecent, indelicate, loathsome, maggoty,
   maltreat, mephitic, miasmal, miasmic, mildewed, mildewy, mistreat,
   misuse, moldy, mucky, musty, nasty, nauseating, nidorous, noisome,
   noxious, objectionable, obnoxious, obscene, odious, odorant,
   odored, odoriferous, odorous, off, offensive, olid, ordurous,
   outrage, pestilential, poisonous, polluted, puky, putrid, rancid,
   rank, reasty, reasy, rebarbative, redolent, reechy, reeking, reeky,
   repellent, repugnant, repulsive, revolting, rotten, rough, scabby,
   scummy, scurfy, shitty, sickening, slabby, slimy, sloppy, sloshy,
   sludgy, slushy, smellful, smelling, smellsome, smelly, spoiled,
   sposhy, stale, stenchful, stenchy, stinking, stinky, strong,
   stuffy, sulfurous, tainted, unbecoming, undecorous, ungodly,
   unseemly, untoward, vile, vomity, wormy, yecchy