The Collaborative International Dictionary
Crack-brained
crackbrained \crackbrained\, Crack-brained
\Crack"-brained`\(-br[=a]nd`), a.
Having an impaired intellect; whimsical; extremely foolish;
crazy; as, crackbrained notions.
--Pope.
Syn: idiotic.
Usage examples of "crack-brained".
There were doubtless many among the Puritans who had no love for the Prelatists, but none save the most crack-brained fanatics could fail to see that the sacking of the Cathedral would set the whole Church of England in arms, and ruin the cause for which they were fighting.
Tower hatching his crack-brained schemes about discovering some mine in the middle of the Guianan jungle.
The book of the Spanish nun has all the properties necessary to make a man crack-brained.