oleaginous
Pronunciation:
/ˌəʊ.lɪˈædʒ.ɪ.nəs//ˌoʊ.liˈædʒ.ɪ.nəs/adjective
Definitions
Oily, greasy.
(of manner or speech) Falsely or affectedly earnest; persuasively suave.
Example: The oleaginous salesman convinced me to buy a more expensive car.