je ne sais quoi 
/ʒənəˌseɪˈkwɑ:/ noun
/ʒənəˌseɪˈkwɑ:/ noun [singular] sometimes humorous : a pleasant quality that is hard to describe
▪ Although the sculpture had flaws, it also had a certain je ne sais quoi that made it very appealing. ◊In French the phrase je ne sais quoi means literally “I know not what.”
▪ Although the sculpture had flaws, it also had a certain je ne sais quoi that made it very appealing. ◊In French the phrase je ne sais quoi means literally “I know not what.”
