English version

not the sharpest tool in the box/shed

From Longman Dictionary of Contemporary Englishnot the sharpest tool in the box/shednot the sharpest tool in the box/shed (also not the brightest crayon in the box), not the brightest bulb on the Christmas tree informal used to say that someone is not very intelligent or is not able to learn things quickly or easily – used humorously not
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