1. in an excessively smooth, suave, or insincerely earnest manner
Usage: often implies false sincerity or oily charm

Examples

• The salesman smiled unctuously as he tried to convince her to buy the overpriced car.
• He spoke unctuously about his charitable work, though everyone knew his true motives.
• The politician unctuously praised his opponent while secretly planning his attack.
• She unctuously complimented the boss, hoping for a promotion.
• The waiter unctuously recommended the most expensive items on the menu.
• He unctuously apologized, but his words rang hollow.