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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]

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