noun
a person or thing that is unique or in a class by itself
adjective
unique
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The artist's work is truly sui generis, with a style that is completely unique.
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Her fashion sense is sui generis - no one else can pull off those bold outfits like she can.
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That new movie is so sui generis, it's unlike anything I've ever seen before.
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His approach to problem-solving is sui generis, always coming up with innovative solutions.