Not the sharpest tool in the shed

Meaning

Not very intelligent or quick-witted.

Usage

Used with mild humorous criticism.

Origin & History

Origins and dates here are approximate summaries. Many idioms have disputed or unknown origins, and not every date has been checked against a historical dictionary, so treat specific dates and stories as a starting point rather than a citation.

Toolbox metaphor that equates dull tools with dull minds.

20th-century American humor used the phrase.