adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'unrepeatable' describes something that cannot be repeated or replicated.
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The scientist discovered an unrepeatable phenomenon in the lab.
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That magic trick was totally unrepeatable, I have no idea how he did it.
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Dude, that party was unrepeatable, we have to do it again next weekend!
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The bond between the two friends was unrepeatable, it was truly special.