je ne sais quoi /ˌʒə nə seɪ ˈkwɑː/ noun [singular] GOOD/EXCELLENTa good quality that you cannot easily describe – often humorous 难以形容的好品质,妙不可言的品质〔常为幽默用法〕 the je ne sais quoi that makes the village magical 使那座村庄具有神奇魅力的不可言传的特质
Origin je ne sais quoi (1600-1700) French “I don't know what”