adjective
An adjective is a word that describes or modifies a noun or pronoun. In this case, 'unstained' describes a noun or pronoun as not marked or tainted by stains or impurities.
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The white tablecloth remained unstained after the dinner party.
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I can't believe my shirt stayed unstained during the food fight.
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Her reputation is completely unstained, unlike some of the other politicians.
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His character is like a sheet of paper, pure and unstained by corruption.