dumb as a rock

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(as) dumb as a rock

1. (US, simile) Very stupid; dumb as a post.
   • 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:

     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.

• dumb as a box of rocks
• dumber than a rock