1. not the sharpest tool in the shed - Noun
2. not the sharpest tool in the shed - Phrase
not the sharpest tool in the shed
(humorous, euphemistic) Lacking in intelligence; dimwitted.
Synonyms: not the brightest bulb in the chandelier, not the sharpest crayon in the box, not the sharpest knife in the drawer, not the sharpest tool in the box, dumb as a bag of hammers, dumb as a box of rocks; see also Thesaurus:stupid