unctuous

Trump is naturally very pleased with this unctuous display of sycophancy.

His duke is a spasm of nervous tics and shifty glances, of unctuous charm and feigned candor.

Chicken drumsticks simmer in a sticky sauce; a whole fish sizzles in a frying pan; an unctuous golden curry bubbles.

The only question then, Eugene Robinson of the Washington Post wrote, "is which of the contenders will be most unctuous and self-abasing in defense of Donald Trump?"

In the midst of this public-relations nightmare, Zoom's response to its estimated 800 million customers wasn't an apology or course correction, but an unctuous "clarification" doubling down on the new ToS.