Word.ws English Dictionary

dumb as a rock

dumb as a rock adjective: very stupid; dumb as a post.

Adjective

(as) dumb as a rock

  1. (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.2023 March 15, Brian X. Chen, Nico Grant, Karen Weise, quoting Satya Nadella, “How Siri, Alexa and Google Assistant Lost the A.I. Race”, in The New York Times, →ISSN

Forms of dumb as a rock

alternative formdumb as rocks

Questions about dumb as a rock

What does dumb as a rock mean?
Dumb as a rock means very stupid; dumb as a post.
What part of speech is dumb as a rock?
Dumb as a rock is an adjective.

Words near dumb as a rock in the dictionary

  1. dumb as a doorknob
  2. dumb as a doornail
  3. dumb as a fish
  4. dumb as a haddock
  5. dumb as a post
  6. dumb as a rock
  7. dumb as a sack of bricks
  8. dumb as a sack of hammers
  9. dumb as a stump
  10. dumb as an ox
  11. dumb as dirt

Source and license

Adapted from Wiktionary: dumb as a rock (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: En-au-dumb as a rock.ogg.

Cite this entry: “dumb as a rock.” Word.ws, https://word.ws/dumb_as_a_rock. Based on Wiktionary, CC BY-SA 4.0.