dumb as a rock
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
Very stupid; dumb as a post.
Where it’s used:
Used
American English
Examples
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.
Usage example from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30)
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “dumb as a rock” mean?
Very stupid; dumb as a post.
Is “dumb as a rock” formal or informal?
No register label has been reviewed yet — treat it as neutral and check the usage notes above.