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Having or showing little sense; foolish: a harebrained scheme.
Usage Note: The first recorded use of harebrained dates to 1548. The spelling hairbrained also has a long history, going back to the 1500s when hair was a variant spelling of hare. The hair variant was preserved in Scotland into the 1700s, and as a result it is impossible to tell exactly when people began writing hairbrained in the belief that the word means "having a hair-sized brain" rather than "with no more sense than a hare." While hairbrained continues to be used, the standard spelling of the word is harebrained.
rash, foolish, or badly thought out: harebrained schemes.
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|Adj.||1.||harebrained - very foolish; "harebrained ideas"; "took insane risks behind the wheel"; "a completely mad scheme to build a bridge between two mountains"|
foolish - devoid of good sense or judgment; "foolish remarks"; "a foolish decision"
1. So senseless as to be laughable:
absurd, foolish, idiotic, imbecilic, insane, lunatic, mad, moronic, nonsensical, preposterous, silly, softheaded, tomfool, unearthly, zany.