crackbrain
slang Someone who is wacky or crazy. There's a guy on our corner who shouts about the end of the world; I think he's a crackbrain. You can't tell people you want to start a business selling bees as pets—they'll think you're a crackbrain! You're a crackbrain if you think that plan will work.
crackbrained
slang Wacky or crazy. There's a guy on our corner who shouts about the end of the world; I think he's a little crackbrained. Oh please, that'll never work—it's a crackbrained idea. You can't tell people you want to start a business selling bees as pets—they'll think you're a crackbrained!
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