Qu'on ne peut exprimer en paroles. Un charme inexprimable.
ETYM Latin ineffabilis: cf. French ineffable. Related to In- not, and Effable, Fame.
Too sacred to be uttered; SYN. unnameable, unspeakable, unutterable.
Indescribable; unspeakable.
Defying expression; SYN. unexpressible.
Not utterable; incapable of being spoken or voiced; inexpressible; ineffable; unspeakable