Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Idiotic.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Having an impaired intellect; whimsical; extremely foolish; crazy.

from The Century Dictionary and Cyclopedia

  • Having an impaired intellect; more or less demented.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. insanely irresponsible

Etymologies

crack +‎ brained. (Wiktionary)

Examples

  • I wonder what would happen to someone if they referred to the million man march as "crackbrained".

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  • One of our friends—thank God for their loyalty, their crazy generosity on this crackbrained project!

    In the Fullness of Time

  • For some reason I can take historical analyses of crackbrained Nazi or Soviet or Roman or American policies.

    Archive 2009-05-10

  • To think that he should be actually in this great, silent penitentiary, a convict, waiting here beside this cheap iron bathtub, not very sweet or hygienic to contemplate, with this crackbrained criminal to watch over him!

    The Financier

  • Sims was ridiculed as a crackbrained egoist and falsifier of evidence.

    Executive Economics

  • Furthermore, in case you decide to emulate your crackbrained captain and his crazed heroics, I am giving you a direct order: No matter what happens, you are not to come after me.

    THE RIFT

  • Rescuing Dessa at all was crackbrained enough; why make matters worse?

    Conan the Valiant

  • The answer that occurred to her was good and logical, at least by the crackbrained logic the phouka swore by.

    War for the Oaks

  • Obedient to the Führer but in deadly rivalry with one another, were four major private empires within the Reich administration and a host of secondary ones, revolving around personalities, crackbrained schemes, forgotten sectors of the economy or administration, whose numbers were to proliferate as the war lengthened.

    Barbarossa

  • "Anyway," I said, trying to head him off, "what's your latest crackbrained theory?"

    The Wind from The Sun

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