not the sharpest tool in the shed

Noun

euphemistic humorous

(humorous, euphemistic) Lacking in intelligence; dimwitted.

Japanese Meaning

あまり賢くなく、知性に欠ける / 頭が悪い、知恵に乏しい / 思慮に欠ける、鈍感な / 知性が低い

My neighbor is not the sharpest tool in the shed, but he's always willing to lend a hand.

近所の人はあまり頭が良くないけれど、いつも進んで手伝ってくれる。

Sense（1）

(humorous, euphemistic) Lacking in intelligence; dimwitted.