adjective
a word that describes or modifies a noun or pronoun. In this case, 'unauthenticated' describes something that has not been confirmed or verified.
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The unauthenticated user was not granted access to the secure database.
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They couldn't get in because they were unauthenticated.
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No entry for the unverified user.
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The unauthenticated keys could not unlock the digital door.