noun
a person of low intelligence
adjective
used to describe someone who is lacking intelligence
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The professor called the student an idiot for not following the instructions.
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My brother is such an idiot sometimes, but I still love him.
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Don't be such an idiot and listen to what I'm saying!
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Trying to fix a leaky pipe without turning off the water first is just asking for trouble - it's like acting like an idiot.