1. 
[syn: buttery, fulsome, oily, oleaginous, smarmy, soapy, unctuous]
The Collaborative International Dictionary of English v.0.48:
Unctuous \Unc"tu*ous\ (?; 135), a. [F. onctueux, LL. unctuosus,
   fr. L. unctus anointment, fr. ungere, unctum, to anoint. See
   Unguent.]
   1. Of the nature or quality of an unguent or ointment; fatty;
      oily; greasy. "The unctuous cheese." --Longfellow.
      [1913 Webster]
   2. Having a smooth, greasy feel, as certain minerals.
      [1913 Webster]
   3. Bland; suave; also, tender; fervid; as, an unctuous
      speech; sometimes, insincerely suave or fervid.
      [1913 Webster] -- Unc"tu*ous*ly, adv. --
      Unc"tu*ous*ness, n.
      [1913 Webster]
WordNet (r) 3.0 (2006):
unctuous
    adj 1: unpleasantly and excessively suave or ingratiating in
           manner or speech; "buttery praise"; "gave him a fulsome
           introduction"; "an oily sycophantic press agent";
           "oleaginous hypocrisy"; "smarmy self-importance"; "the
           unctuous Uriah Heep"; "soapy compliments" [syn:
           buttery, fulsome, oily, oleaginous, smarmy,
           soapy, unctuous]
Moby Thesaurus II by Grady Ward, 1.0:
84 Moby Thesaurus words for "unctuous":
   Pecksniffian, Tartuffian, Tartuffish, adipose, adulatory, affected,
   bland, blandishing, blarneying, blubbery, buttery, butyraceous,
   cajoling, canting, chrismal, chrismatory, complimentary,
   courtierly, courtly, disarming, fair-spoken, false, fat, fatty,
   fawning, fine-spoken, flattering, fulsome, glib, goody,
   goody-goody, greasy, gushing, holier-than-thou, honey-mouthed,
   honey-tongued, honeyed, hypocritic, hypocritical, ingratiating,
   insincere, insinuating, lardaceous, lardy, mealymouthed, mucoid,
   obsequious, oily, oily-tongued, oleaginous, oleic, pharisaic,
   pharisean, pietistic, pious, rich, sanctified, sanctimonious,
   sebaceous, self-righteous, simon-pure, sleek, slick, slimy,
   slippery, slobbery, smarmy, smooth, smooth-spoken, smooth-tongued,
   smug, sniveling, soapy, soft-soaping, soft-spoken, suave,
   suave-spoken, suety, sycophantic, tallowy, unguent, unguentary,
   unguentous, wheedling