(as) dumb as a box of rocks

(as) dumb as a box of rocks

Very stupid. You took apart the entire washing machine just to unblock the pump? I swear, sometimes you can be as dumb as a box of rocks, Larry. I used to think she was dumb as a box of rocks when we were kids, but she grew up to be a particle physicist. Are you dumb as a box of rocks? Why would you touch the alarm when the sign clearly says "DO NOT TOUCH" in bold red letters?

See also: box, dumb, of, rock

Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.