not the sharpest tool in the box | not the sharpest knife in the draweridiomPart oftoolnot the sharpest tool in the box | not the sharpest knife in the drawernot the sharpest tool in the box | not the sharpest knife in the drawer — idiomidiom1. Not very intelligent or quick to understand things.1.idiomDefinitionNot very intelligent or quick to understand things.ExampleMaya is kind but not the sharpest tool in the box.Do you think he's not the sharpest knife in the drawer?