thick as a brick

Adjective

Meaning

thick as a brick (not comparable)

(simile) Very stupid; slow to learn or understand.

Synonyms: dumb as an ox; see also Thesaurus:stupid

Source: en.wiktionary.org

Synonyms

mentally retarded

Antonyms

cunning

Close letter words and terms

thick and threefold thick angle thick around the middle thick as a plank thick as a whale omelette thick as champ