adjective
a word that describes or modifies a noun or pronoun, in this case, 'unmistaken' describes something that is not mistaken or incorrect
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The evidence was unmistaken, pointing to the suspect's guilt beyond any doubt.
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I could tell by her unmistaken expression that she was not happy with the news.
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His unmistaken swagger showed that he was confident in his abilities.
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The artist's brush strokes were unmistaken, each one adding to the beauty of the painting.