Definition of unctuous
- excessively flattering
- overly smooth or polite in an insincere way
- oily or greasy in manner or speech
Usage examples of unctuous
The salesman sounded unctuous when he kept praising the customer as brilliant while pushing an overpriced product.
Her unctuous apology, full of smooth compliments and no real responsibility, made everyone doubt her sincerity.
He greeted the executives with an unctuous smile and exaggerated politeness, clearly hoping to gain favor.