noun
a person who is very stylish or fussy in their appearance or behavior
adjective
fussy or overly elaborate in style
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The chichi restaurant we went to last night had impeccable service.
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She always wears such chichi clothes, it's like she's a fashion icon.
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That party was so chichi, everyone was dressed to impress.
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His chichi attitude towards work often rubs his colleagues the wrong way.