Longman Dictionary of Contemporary English homepage

Date: 1600-1700
Language: French
Origin: 'I don't know what'

je ne sais quoi

 noun
     
je ne sais quoi [singular]
a good quality that you cannot easily describe - often humorous:
the je ne sais quoi that makes the village magical
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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