asinine

If you want to call someone a jerk while sounding smart yourself, asinine is your go-to word.

Asinine derives from the Latin asinus. Guess what that means? Bonus: Asinine takes stupid up a notch. There's someone so delightful in the double-edged quality of asinine behavior. Talking trash about your boss is stupid. Talking trash about your boss in an email they're cc'd on...that's asinine.

Definitions of asinine
1

adj devoid of intelligence

Synonyms:
fatuous, inane, mindless, vacuous
foolish
devoid of good sense or judgment