adjective
a word that describes or modifies a noun or pronoun, in this case, 'unexcited' describes a lack of excitement
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She appeared unexcited about the upcoming business conference.
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I'm feeling pretty unexcited about going to the party tonight.
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I'm totally unexcited for this movie, it looks boring.
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His unexcited demeanor was like a dark cloud hanging over the group.