adjective
A word that describes or modifies a noun or pronoun. In this case, 'unusual' describes something that is not common or typical.
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The results of the experiment were quite unusual compared to previous studies.
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It's kind of unusual to see him wearing a suit instead of his usual t-shirt.
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That party was so unusual, I've never seen anything like it before.
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His choice of words was quite unusual, it really caught me off guard.