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quoi

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je ne sais quoi

A positive or pleasant quality that is difficult to define. This French phrase translates to "I don't know what" in English. She had a certain je ne sais quoi that men found quite attractive.

See also: Je, Ne, quoi, sais

a je ne sais quoi

a pleasant quality which you cannot describe or name He's not particularly attractive but he has a certain je ne sais quoi which women find irresistible.

See also: Je, Ne, quoi, sais