je ne sais quoi
noun /ʒə nə seɪ ˈkwɑː/
/ʒə nə seɪ ˈkwɑː/
[uncountable] (from French, often humorous)- 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’.