unc·tu·ous (ngkch-s) KEY
Middle English, from Old French unctueus, from Medieval Latin nctusus, from Latin nctum, ointment, from neuter past participle of unguere, to anoint
unctu·ous·ly(Adverb), unctu·ous·ness or unctu·osi·ty (-s-t) KEY (Noun)
unctuous, fulsome, oily, oleaginous, smarmy
These adjectives mean insincerely, self-servingly, or smugly agreeable or earnest: an unctuous toady; gave the dictator a fulsome introduction; oily praise; oleaginous hypocrisy; smarmy self-importance.