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Adjective: crackbrained  'krak`breynd
  1. Insanely irresponsible
    - idiotic

See also: insane

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crabwise
Cracidae
crack
crack addict
crack cocaine
crack down
crack of doom
crack shot
crack up
crack willow
crackbrained
crackdown
cracked
cracked wheat
cracked-wheat bread
cracker
cracker bonbon
cracker crumbs
cracker-barrel
crackerberry
crackerjack