unctuous
('ungk·choo·ŭs)
[adj.]
1. unpleasantly and excessively or insincerely earnest or ingratiating.
2. containing or having the quality of oil or ointment; greasy, slippery, suave.
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ExampleExample
I left without test driving the car because the salesperson was so unctuous that I couldn’t trust him.
