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Oleaginous (adjective)
Oily, greasy.
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Oleaginous (adjective)
Falsely or affectedly earnest; persuasively suave.
“The oleaginous salesman convinced me to buy a more expensive car.”
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Unctuous (adjective)
Oily or greasy.
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Unctuous (adjective)
Rich, lush, intense, with layers of concentrated, soft, velvety flavor.
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Unctuous (adjective)
Profusely polite, especially unpleasantly so and insincerely earnest.
Wiktionary
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