je ne sais quoi /ˌʒə nə seɪ ˈkwɑː/
noun [singular][
Date: 1600-1700;
Language: French;
Origin: 'I don't know what']
a good quality that you cannot easily describe – often humorous:
the je ne sais quoi that makes the village magical [TahlilGaran] Dictionary of Contemporary English ▲