dumber than a box of rocks
An American slang simile meaning extraordinarily stupid, describing someone whose intelligence is comparable to an inanimate collection of stones — which is to say, absent entirely.
Definitions
An American slang simile meaning extraordinarily stupid, describing someone whose intelligence is comparable to an inanimate collection of stones — which is to say, absent entirely. The image is deliberately absurdist and vivid: rocks have no intelligence at all, so being dumber than a box of them is a spectacular insult. Commonly heard in the American South and rural regions, it's colourful trash talk delivered with a straight face for maximum comedic effect.
Anyone who puts their full name and home address in a ransom note is dumber than a box of rocks.
Comments
(slang) Very stupid.
“He is the America's first idiot! Dumber than a box of rocks!”
“He is the America's first idiot! Dumber than a box of rocks!”
— Bluesky· May 2026
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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Semantically related
- dumb as a box of rocks91%
(simile, slang) Very stupid.
- dumb as a rock76%
(US, simile) Very stupid; dumb as a post.
- dumb as dirt71%
An American simile meaning spectacularly, almost impressively stupid. The comparison to dirt — the most ordinary, inert substance imaginable — underscores that the person being described has achieved a kind of peak dullness. Used affectionately among friends or as a pointed insult depending on tone, 'dumb as dirt' is a timeless piece of folksy American trash talk that's found its way into everyday conversation across the English-speaking world.
- dumb as dirt69%
(slang, simile) Extremely stupid.