oleaginous

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”
• “soapy compliments”

containing an unusual amount of grease or oil

• “greasy hamburgers”
• “oily fried potatoes”
• “oleaginous seeds”