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English definition of “unctuous”

unctuous

adjective uk   /ˈʌŋk.tju.əs/ formal disapproving us  
describes people or behaviour expressing too much praise, interest, friendliness, etc., in a way that is false and unpleasant: his unctuous manner/voice/smilePraising insincerely or too eagerly
(Definition of unctuous from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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