dumb as a rock

adjective

Very stupid; dumb as a post.

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Meanings

adjective(as) dumb as a rock

alternative dumb as rocks

  1. USsimileVery 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

Synonyms & antonyms

Also see
not the sharpest tool in the shed
Cite this entry
APA

dumb as a rock. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/dumb%20as%20a%20rock

MLA

“dumb as a rock.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/dumb%20as%20a%20rock. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “dumb as a rock,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/dumb%20as%20a%20rock.

Source: dumb as a rock on Wiktionary, CC BY-SA 4.0.