crackbrain

crackbrain

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.

crackbrained

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.
See also: crackbrain
Farlex Dictionary of Idioms.

crackbrain

n. a fool; a stupid oaf. Did you hear about the crackbrain who said he found part of the sky floating in the lake?

crackbrained

mod. stupid; ridiculous. I’ve heard enough of your crackbrained schemes.
See also: crackbrain
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • plumb crazy
  • crazy like a fox
  • nut up
  • crazy in the head
  • (as) crazy as a bedbug
  • crazy as a bedbug
  • crazy as a loon
  • bedbug
  • peach
  • (as) crazy as a peach-orchard boar