Meaning : Unpleasantly and excessively suave or ingratiating in manner or speech.
Example :
Buttery praise.
Gave him a fulsome introduction.
An oily sycophantic press agent.
Oleaginous hypocrisy.
Smarmy self-importance.
The unctuous Uriah Heep.
Soapy compliments.
Synonyms : buttery, oily, oleaginous, smarmy, soapy, unctuous