noun
a stupid or slow-witted person
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The professor was frustrated with the dimwit student who never seemed to understand the material.
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My little brother can be such a dimwit sometimes, always forgetting where he put his keys.
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Don't listen to him, he's just a dimwit who doesn't know what he's talking about.
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Her mind was like a dimwit, unable to grasp the complexity of the situation.