Unctuous

Adjective

1. Having the nature or properties of an unguent or ointment; greasy, oily.
2. Having fat or oil present; fatty, greasy, oily.
3. Of an aroma or taste, or a beverage (such as coffee or wine) or food (such as gravy, meat, or sauce): having layers of concentrated, velvety flavour; lush, rich.
4. Of soil: soft and sticky.
5. Of a person: Complacent, self-satisfied, smug. Profusely polite, especially in an insincere and unpleasant manner.