noun
A derogatory term used to describe someone who is perceived to be unintelligent or foolish
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The professor was frustrated with the student's lack of understanding, referring to them as a peabrain.
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My brother can be such a peabrain sometimes, always forgetting where he put his keys.
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Don't listen to him, he's just a peabrain who doesn't know what he's talking about.
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Her decision-making skills are like that of a peabrain, always making impulsive choices without thinking things through.