noun
a characteristic, habit, mannerism, or the like, that is peculiar to an individual
adjective
relating to or characteristic of a particular individual; peculiar
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The artist's style is quite idiosyncratic, making it easily recognizable.
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Her taste in music is so idiosyncratic, she only listens to obscure indie bands.
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His fashion sense is totally idiosyncratic, always mixing and matching unexpected pieces.
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The idiosyncratic nature of her personality is like a colorful mosaic, each piece unique and intriguing.