Definition of unctuous adjective from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈʌŋktjuəs//
; NAmE NAmE//ˈʌŋktʃuəs//
(formal, disapproving)
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friendly or giving praise in a way that is not sincere and which is therefore unpleasant an unctuous host Word Originlate Middle English (in the sense ‘greasy’): from medieval Latin unctuosus, from Latin unctus ‘anointing’, from unguere ‘anoint’.
See the Oxford Advanced American Dictionary entry: unctuous