Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Medieval Latin
Origin: unctuosus, from Latin unctum 'ointment', from unguere; UNGUENT

unctuous

 adjective
     
unc‧tu‧ous formal
too friendly and praising people too much in a way that seems very insincere
—unctuously adverb
—unctuousness noun [uncountable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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