noun
a noun is a word that refers to a person, place, thing, event, substance, or quality
adjective
a word that describes or modifies a noun or pronoun
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His overconfidence in his abilities led to his downfall in the competition.
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She was so overconfident that she didn't even bother preparing for the presentation.
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Don't get too cocky, your overconfidence might cost you in the end.
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His overconfidence was like a blindfold, preventing him from seeing the reality of the situation.