(in a positive sense) Having a sweet and smooth voice; eloquent.
(in a negative sense) Indirect, delivering a message in a way that will make it seem more pleasant to the hearer(s); seductive, persuasive.
Profusely polite, especially unpleasantly so and insincerely earnest.
Rich, lush, intense, with layers of concentrated, soft, velvety flavor.
Oily or greasy.