not the sharpest knife in the drawer
Lacking mental acuity
Not the sharpest knife in the drawer describes someone who lacks intelligence or quick thinking.
The phrase works through understatement—calling someone not the sharpest implies they're rather dull.
It's gentler than calling someone stupid outright, often used with affection or mild exasperation: He's a sweet guy, but not the sharpest knife in the drawer.
Variations substitute other sharp objects: tool in the shed, crayon in the box.
- dimwittedLacking mental acuity
- slow-wittedLacking mental quickness
- simplemindedLacking mental acuity
- thickheadedStubbornly slow-witted
- unintelligentLacking cognitive ability
obtuse · dull · lights are on but nobody's home · half-witted · dim bulb · sharp as a marble · clueless · witless · dense · dumb as a box of rocks · dumb · not the brightest bulb · unperceptive · blockhead · feeble-minded · slow on the uptake · dull as dishwater · thick as a brick
not the sharpest knife in the drawersharp as a tack
Extremely intelligent and alert
brilliant · whip-smart · genius · quick-witted · clever
not the sharpest knife in the drawernobody's fool
Person not easily deceived
sharp cookie · on the ball · knows their stuff · cream of the crop · competent
sharper, sharpest, sharpness, sharpen, sharpened, sharpening, sharpener, drawer, drawers