English

Definition of je ne sais quoi noun from the Oxford Advanced Learner's Dictionary

 

je ne sais quoi

 noun
noun
BrE BrE//ˌʒə nə seɪ ˈkwɑː//
 
; NAmE NAmE//ˌʒə nə seɪ ˈkwɑː//
 
[uncountable] (from French, often humorous)
 
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a good quality that is difficult to describe He has that je ne sais quoi that distinguishes a professional from an amateur. Word OriginFrench, literally ‘I do not know what’.
See the Oxford Advanced American Dictionary entry: je ne sais quoi