unctuous

unctuous \UNGK-choo-us\ , adjective:
1. Of the nature or quality of an unguent or ointment; fatty; oily; greasy.
2. Having a smooth, greasy feel, as certain minerals.
3. Insincerely or excessively suave or ingratiating in manner or speech; marked by a false or smug earnestness or agreeableness

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Wow, a word that describes both politicians AND televangelists.