Definition of je ne sais quoi noun from the Oxford Advanced American Dictionary

 

je ne sais quoi

 noun
noun
NAmE//ˌʒə nə seɪ ˈkwɑ//
 
[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.
See the Oxford Advanced Learner's Dictionary entry: je ne sais quoi