• (British) IPA: /ˌʒə nə seɪ ˈkwɑː/
• (America) IPA: /ˌʒə nə seɪ ˈkwɑ/
• (emulating French) IPA: /ˌʒə n(ə) sɛ ˈkwɑː/

je ne sais quoi (uncountable)

1. An indefinable quality that makes something distinctive or attractive.

   She has a certain je ne sais quoi about her.

   • 1894, George du Maurier, “Part Second”, in Trilby: A Novel, New York, N.Y.: Harper & Brothers, OCLC 174215199 ↗, page 85 ↗:

     "Say, you others, I find that the Englishman has something of truly distinguished in the voice, something of sympathetic, of touching—something of je ne sais quoi!" Bouchardy: "Yes, yes—something of je ne sais quoi! That's the very phrase— [...]"

• French: je ne sais quoi, je-ne-sais-quoi, Dieu sait quoi, on ne sait quoi
• German: gewisse Etwas
• Italian: non so che
• Portuguese: não-sei-quê
• Russian: этакий
• Spanish: no sé qué