unc ‧ tu ‧ ous /ˈʌŋktʃuəs/ BrE AmE adjective formal
[ Date: 1300-1400 ; Language: Medieval Latin ; Origin: unctuosus , from Latin unctum 'ointment' , from unguere ; ⇨ ↑ unguent ]
too friendly and praising people too much in a way that seems very insincere SYN ingratiating
—unctuously adverb
—unctuousness noun [uncountable]