Definition of: unctuous

(ungk′ch·əs) adjective
1. Having the characteristics of an unguent; greasy.
2. Characterized by deep sympathetic feeling.
3. Characterized by affected emotion; hence, oily–tongued; unduly suave.
4. Being greasy or soapy to the touch, as certain minerals.
5. Soft; rich in organic matter, as certain soils.
6. Having plasticity, as clay. [<Med. L unctuosus <L unctum ointment, orig. neut. pp. of ungere anoint]
—unc′tu·ous·ly adverb
—unc′·tu·ous·ness noun
—unc′tu·os′i·ty (-ch·os′ə·tē) noun