Unctuous

Part of speech: adjective (a.)

1. Of the nature or quality of an unguent or ointment; fatty; oily; greasy. "The unctuous cheese." Longfellow.

2. Having a smooth, greasy feel, as certain minerals.

3. Bland; suave; also, tender; fervid; as, an unctuous speech; sometimes, insincerely suave or fervid. -- Unc"tu*ous*ly, adv. -- Unc"tu*ous*ness, n.