A foolish or scatterbrained person; someone who acts without thinking.
From 'crack' (meaning broken or flawed) + 'brain' (mind), combining English words to describe a person whose thinking is damaged or unreliable. First used in the 1500s to insult someone's mental capacity.
This word emerged during Shakespeare's time as an insult for actors and playwrights to hurl at each other—people saw the theater world as full of crackbrains!
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