a. [ L. oleaginus, oleagineus, belonging to the olive, fr. olea olive: cf. F. oléagineux. See Olive, Oil. ] Having the nature or qualities of oil; oily; unctuous. [ 1913 Webster ]
(adj) unpleasantly and excessively suave or ingratiating in manner or speech, Syn. smarmy, oleaginous, oily, unctuous, soapy, fulsome, Example:buttery praise; gave him a fulsome introduction; an oily sycophantic press agent; oleaginous hypocrisy; smarmy self-importance; the unctuous Uriah Heep; soapy compliments