Je-ne-sais-quoi definitions

zhə' nə sā kwä', sĕ
A quality or attribute that is difficult to describe or express.
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A quality that is hard to describe or express.
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An intangible quality that makes something distinctive or attractive.

She has a certain je ne sais quoi about her.

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Origin of je-ne-sais-quoi

French je I ne not sais first person present indicative of savoir to know quoi what