Unctuous is an adjective. It means excessively or insincerely polite.
Rick- Can you hand me that remote next to you, please?
James- Yes master, anything for you. I am not worthy. Forgive me.
Rick- What? Stop being so unctuous.
James- Fine. How about you get it yourself, noob.
Unctuous - (v.) Characteristic of an ointment; something oily or greasy.
Robert Pattinson has very unctuous hair! WHY DOES EVERY TWILIGHT FAN LIKE HIM? IT'S SO DISGUSTING!