In‐ef″fa‐ble (?), a. [L. ineffabilis: cf. F. ineffable. See In- not, and Effable, Fame.] Incapable of being expressed in words; unspeakable; unutterable; indescribable; as, the ineffable joys of heaven.
Contentment with our lot... will diffuse ineffable contentment over the soul. Beattie.