unctuous
Pronunciation:
/ˈʌnktʃuəs/adjective
Definitions
(of a liquid or substance) Oily or greasy.
(of a wine, coffee, sauce, gravy etc.) Rich, lush, intense, with layers of concentrated, soft, velvety flavor.
(by extension, of a person) Profusely polite, especially unpleasantly so and insincerely earnest.