noun
a foolish or unintelligent person
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The professor referred to the student as a lamebrain for not understanding the complex theory.
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My brother can be such a lamebrain sometimes, always forgetting important things.
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Don't listen to him, he's just a lamebrain who doesn't know what he's talking about.
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Her decision to quit her stable job and pursue her passion was seen as a move of a lamebrain by her conservative family.