be (as) thick as a brick

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be (as) thick as a brick

To be remarkably stupid, dimwitted, or obtuse. I smoked a lot of marijuana when I was in high school, so I was as thick as a brick by the time I finally graduated. Jen's new girlfriend is very nice, but she's thick as a brick.
See also: brick, thick
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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