1. unpleasantly and excessively suave or ingratiating in manner or speech;

"buttery praise"

"gave him a fulsome introduction"

"an oily sycophantic press agent"

"oleaginous hypocrisy"

"smarmy self-importance"

"the unctuous Uriah Heep"

2. containing an unusual amount of grease or oil;

"greasy hamburgers"

"oily fried potatoes"

"oleaginous seeds"