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unctuous

1 ENTRIES FOUND:
unctuous /ˈʌŋktʃəwəs/ adjective
unctuous
/ˈʌŋktʃəwəs/
adjective
Britannica Dictionary definition of UNCTUOUS
[more unctuous; most unctuous] formal + disapproving
used to describe someone who speaks and behaves in a way that is meant to seem friendly and polite but that is unpleasant because it is obviously not sincere

— unctuously

adverb

— unctuousness

noun [noncount]