dumb as a rock

Adjective

Meaning

(as) dumb as a rock

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

Source: en.wiktionary.org

Examples

Crazy Joe Scarborough and dumb as a rock Mika are not bad people, but their low rated show is dominated by their NBC bosses. Too bad! Donald Trump

Close letter words and terms

dumb as a doorknob dumb as a doornail dumb as a post dumb as a sack of hammers dumb as a stick dumb as a stump