dumber than a doornail

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dumber than a doornail

Very stupid. You took apart the entire washing machine just to unblock the pump? I swear, sometimes you can be dumber than a doornail, Larry. I used to think that kid was dumber than a doornail, but he turned out to be a physicist.
See also: doornail, dumber
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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