dumb as a rock
(US, simile) Very stupid; dumb as a post.
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At least I know Mr. Wrong and his dumb as a rock GF will vote for her. As will many people I know in Ohio. But too many morons won't think before voting.
She failed at reading the room. Democrats have forgotten that economics has to be the number one priority with voters. Trump recognized it, and lied his way to be the economic leader even though he’s dumb as a rock an…
Definitions
(US, simile) Very stupid; dumb as a post.
Voice assistants are “dumb as a rock,” Satya Nadella, Microsoft’s chief executive, said in an interview this month with The Financial Times, declaring that newer A.I. would lead the way.
“At least I know Mr. Wrong and his dumb as a rock GF will vote for her. As will many people I know in Ohio. But too many morons won't think before voting.”
— Bluesky· May 2026“She failed at reading the room. Democrats have forgotten that economics has to be the number one priority with voters. Trump recognized it, and lied his way to be the economic leader even though he’s dumb as a rock and couldn’t care less about 99% of Americans.”
— 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 rocks83%
(simile, slang) Very stupid.
- dumber than a box of rocks77%
(slang) Very stupid.
- dumber than a box of rocks76%
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.
- dumb as dirt75%
(slang, simile) Extremely stupid.
- dumb as a doorknob74%
(simile, slang) Very stupid.