RichThesaurus
dumb as a box of rocks
vs
thick as champ
dumb as a box of rocks
adj
Very stupid.
thick as champ
adj
Very ignorant or foolish, sullen or in a bad temper.
How often have the words
dumb as a box of rocks
and
thick as champ
occurred in a corpus of books?
(source:
Google Ngram Viewer
)