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English definition of “je ne sais quoi”

je ne sais quoi

noun [S]     /ˌʒə.nə.seɪˈkwɑː/
a pleasing quality that cannot be exactly named or described : Although he's not conventionally attractive , he has a certain je ne sais quoi that makes him popular with the ladies .Foreign words and phrases used in English
(Definition of je ne sais quoi noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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