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Longman Dictionary of Contemporary English
hare-brained
adjective
EXAMPLES FROM OTHER ENTRIES
▪ Alice had to figure out how to pay the rent after Ralph spent the money on another of his hare-brained schemes.
EXAMPLES FROM CORPUS
▪ It's just a hare-brained theory of mine.
▪ Self magazine has a hare-brained interpretation in its current issue.
▪ This Government's many imaginative and effective initiatives are far more helpful to the regions than any hare-brained scheme from Labour.
Douglas Harper's Etymology Dictionary
hare-brained

also harebrained, 1550s, from hare-brain "giddy or reckless person" (1540s), probably from hare, on notion of "flighty, skittish."

Wiktionary
hare-brained

a. (alternative form of harebrained English) alt. (alternative form of harebrained English)

Usage examples of "hare-brained".

I could have been safe at home, pleasuring myself groggy with Elspeth and sponging off her skinflint father, facing nothing worse than the prospect of bear-leading her family in Society, and here I was imprisoned in a lonely castle with five dangerous lunatics bent on dragooning me into a hare-brained adventure that was certain to put my head in a noose.

There, he had been privileged to lend his aid to his dazzling friend in various hare-brained exploits.

And so you see, Enoch, I am well accustomed to others devising hare-brained plans for how I am to live.

Whole sections had been taken over by the King’s pack of semi-feral spaniels, who’d become inbred even by Royal standards and thus hare-brained even by Spaniel standards.

I didn't even dare think of the risks of their hare-brained impersonation scheme, but on the other hand I couldn't contemplate the alternative if I refused.

I suppose to approach the thing in any other way would have been useless, for it would have been constant admission of the imposture, and what an idiot, hare-brained scheme it was.