adjective
a word that describes or modifies a noun or pronoun, in this case 'uninterested' describes someone who lacks interest or enthusiasm
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The board members were uninterested in the proposal presented by the new company.
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She seemed uninterested in going to the party tonight.
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He's totally uninterested in anything that doesn't involve video games.
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His mind was uninterested in the mundane tasks of everyday life, always yearning for something more exciting.