RichThesaurus
dumb as an ox
vs
not the sharpest tool in the shed
dumb as an ox
adj
Stupid.
not the sharpest tool in the shed
noun
Lacking in intelligence; dimwitted.
How often have the words
dumb as an ox
and
not the sharpest tool in the shed
occurred in a corpus of books?
(source:
Google Ngram Viewer
)