not the sharpest tool in the box

not the sharpest tool in the box

Not intelligent; stupid or dim-witted. Her new boyfriend isn't the sharpest tool in the box, but he's pretty good looking! I wasn't the sharpest tool in the box in school, but I still managed to find a profession I loved.
See also: box, not, sharp, tool
Farlex Dictionary of Idioms.
See also:
  • not the sharpest tool in the shed
  • not the sharpest pencil in the cup
  • not the sharpest knife in the drawer
  • have a thick head
  • thickheaded
  • have a thick skull
  • smurfbrain
  • airbrain
  • airhead
  • couldn't find (one's) way out of a paper bag