adjective
having or showing a lack of sense or judgment; foolish
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The harebrained scheme proposed by the junior team was quickly dismissed by the board of directors.
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I can't believe you actually went through with that harebrained idea of yours.
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His harebrained plan to skip school and go to the beach got him into trouble with his parents.
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Her harebrained decision to quit her job without another one lined up left her in a difficult situation.