IdiomThe AbsurdEnglish

thick as a brick

Meaning: Very stupid.

Example: “He's charming enough, but when it comes to directions he's thick as a brick.”

Origin: British slang built on "thick" meaning dull-witted, one of several comparisons like "thick as two short planks." It was popularized by Jethro Tull's 1972 album of that name.

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