unpleasantly and excessively suave or ingratiating in manner or speech
e.g. buttery praise
e.g. gave him a fulsome introduction
e.g. an oily sycophantic press agent
e.g. oleaginous hypocrisy
e.g. smarmy self-importance
e.g. the unctuous Uriah Heep
e.g. soapy compliments
Synonym: buttery oily oleaginous smarmy soapy unctuous