a. [ L. ineffabilis: cf. F. ineffable. See In- not, and Effable, Fame. ] Incapable of being expressed in words; unspeakable; unutterable; indescribable;
Contentment with our lot . . . will diffuse ineffable contentment over the soul. Beattie. [ 1913 Webster ]
n. The quality or state of being ineffable or unutterable; unspeakableness. [ 1913 Webster ]