1. Containing an unusual amount of grease or oil: Mrs. Black complained to the waiter that her pizza was much too oleaginous and greasy and wanted to return it.
2. Descriptive of an oil in nature or consistency: When Judy didn't wash her hair for more than a week, she noticed that it seemed to be quite oleaginous!
4. Unpleasantly eager to please, charm, or to be of service to people: The salesman was overly oleaginous to Mrs. Smith who only wanted to buy a simple vacuum cleaner.
5. Unpleasantly and excessively suave or ingratiating in manner or speech, such as "oleaginous hypocrisy" or an "oleaginous comment": Susan was an oleaginous hypocrite who showered Grace with exaggerated compliments.
6. Etymology: directly and via Old French oleagineux, from Latin oleaginus, "of an olive tree, oily, greasy".