characterized by excessive piousness or moralistic fervor, especially in an affected manner; excessively smooth, suave, or smug.
of the nature of or characteristic of an unguent or ointment; oily; greasy.
having an oily or soapy feel, as certain minerals.

1350–1400; Middle English < Medieval Latin ūnctuōsus, equivalent to Latin ūnctu(s) act of anointing (ung(uere) to smear, anoint + -tus suffix of v. action) + -ōsus -ous

unctuously, adverb
unctuousness, unctuosity [uhngk-choo-os-i-tee] , noun
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World English Dictionary
unctuous (ˈʌŋktjʊəs)
1.  slippery or greasy
2.  affecting an oily charm
[C14: from Medieval Latin unctuōsus, from Latin unctum ointment, from ungere to anoint]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

late 14c., "oily," from O.Fr. unctueus, from M.L. unctuosus "greasy," from L. unctus "act of anointing," from pp. 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.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

unctuous unc·tu·ous (ŭngk'chōō-əs)
Containing or composed of oil or fat.

unc'tu·ous·ness or unc'tu·os'i·ty (-ŏs'ĭ-tē) n.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
When bitten, they collapsed with an unctuous squelch.
Dinner specials are described by waiters in the tones of unctuous coroners announcing the results of autopsies.
In the testing of unctuous materials that adhere readily to the skin, mesh wire screen may be employed instead of the sleeve.
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