adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'unread' describes something that has not been read.
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The report contains several unread messages that need to be addressed.
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I have so many unread emails in my inbox, it's overwhelming.
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I always leave my texts unread so people think I'm busy.
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His emotions were like an unread book, difficult to decipher.