adjective
showing a lack of good sense or judgment; foolish
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The hare-brained scheme proposed by the new intern was quickly dismissed by the board of directors.
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I can't believe you actually went through with that hare-brained idea.
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That hare-brained plan is never going to work, dude.
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Her hare-brained decision to quit her stable job and travel the world turned out to be the best choice she ever made.