1.Definition: containing an unusual amount of grease or oil

"Oleaginous seeds"

Related Adjective(s):greasy, oily, sebaceous

2.Definition: unpleasantly and excessively suave or ingratiating in manner or speech

"Oleaginous hypocrisy"

Related Adjective(s):buttery, fulsome, oily, smarmy, soapy, unctuous