unctuous

adjective6

1. •
   Having the nature or properties of an unguent or ointment; greasy, oily.

   • It is, of the one part, / A humide exhalation, vvhich vve call / Materia liquida, or the Vnctuous VVater; […] — 1610
2. •
   (figurative) Profusely polite, especially in an insincere and unpleasant manner.

   • Then he thoroughly disliked the tone of Mr. Slope's letter; it was unctuous, false, and unwholesome, like the man. — 1857
3. •
   Having fat or oil present; fatty, greasy, oily.
4. •
   Of an aroma or taste, or a beverage (such as coffee or wine) or food (such as gravy, meat, or sauce): having layers of concentrated, velvety flavour; lush, rich.

   • "Unctuous is probably quite a good description, but there's a sweetness, too, and a mouthfeel," ventures Heston Blumenthal, chef at the Fat Duck at Bray. — 2000
5. •
   (figurative) Complacent, self-satisfied, smug.
6. •
   Of soil: soft and sticky.

   • Chalk is of tvvo Sorts, the hard dry strong Chalk, vvhich is the best for Lime; and a soft unctuous Chalk, vvhich is the best for Lands, because it easily dissolves vvith Rain and Frost. — 1708