What is definition of unctous?

Unctuous has two definitions:

  1. Having a greasy or oily texture or appearance, often in a way that is unpleasant or excessive. Example: The pizza was so unctuous that it left an oily residue on my fingers.

  2. Having an overly smooth or insincere manner, often in a way that is intended to flatter or manipulate others. Example: His unctuous compliments made me feel uncomfortable, like he was trying to get something from me.