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unctuous (adj.)

late 14c., "oily, having a greasy or soapy feeling when touched," from Old French unctueus, from Medieval Latin unctuosus "greasy," from Latin unctus "act of anointing," from past participle stem of unguere "to anoint" (see unguent).

Figurative sense of "blandly ingratiating" is first recorded 1742, perhaps in part with a literal sense, but in part a sarcastic usage from unction in the meaning "deep spiritual feeling" (1690s), such as comes from having been anointed in the rite of unction. Related: Unctuously; unctuousness.

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Definitions of unctuous from WordNet

unctuous (adj.)
unpleasantly and excessively suave or ingratiating in manner or speech;
the unctuous Uriah Heep
Synonyms: buttery / fulsome / oily / oleaginous / smarmy / soapy
From wordnet.princeton.edu