GNU Collaborative International Dictionary of English

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1.       
   Unctuous , a. [F. onctueux, LL. unctuosus, fr. L. unctus anointment, fr. ungere, unctum, to anoint. See Unguent.]
   Of the nature or quality of an unguent or ointment; fatty; oily; greasy. “The unctuous cheese.” 
   Longfellow.
   
   1913 Webster
   Having a smooth, greasy feel, as certain minerals.
   1913 Webster
   Bland; suave; also, tender; fervid; as, an unctuous speech; sometimes, insincerely suave or fervid.
   1913 Webster
   -- Unc"tu*ous*ly, adv. -- Unc"tu*ous*ness, n.
   1913 Webster