(as) dumb as a fencepost

(as) dumb as a fencepost

Very stupid. You took apart the entire washing machine just to unblock the pump? I swear, sometimes you can be as dumb as a fencepost, Larry. I used to think that kid was dumb as a fencepost, but he turned out to be a physicist.
See also: dumb
Farlex Dictionary of Idioms.
See also:
  • (as) dumb as a post
  • dumb as a post
  • dumber than a doornail
  • dumber
  • dumber than a bag of hammers
  • dumb
  • swear down
  • swear
  • have clean hands
  • clean hands, have