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WordReference Random House Learner's Dictionary of American English © 2024unc•tu•ous /ˈʌŋktʃuəs/USA pronunciation adj. - showing a false or pretended concern or interest;
insincerely earnest:gave the new boss an unctuous greeting.
unc•tu•ous•ly, adv. unc•tu•ous•ness, n. [uncountable] WordReference Random House Unabridged Dictionary of American English © 2024unc•tu•ous (ungk′cho̅o̅ əs),USA pronunciation adj. - characterized by excessive piousness or moralistic fervor, esp. 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.
- Medieval Latin ūnctuōsus, equivalent. to Latin ūnctu(s) act of anointing (ung(uere) to smear, anoint + -tus suffix of verb, verbal action) + -ōsus -ous
- Middle English 1350–1400
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