#1 ineffable s. [indefinable, indescribable, unspeakable, untellable, unutterable] defying expression or description; "indefinable yearnings"; "indescribable beauty"; "ineffable ecstasy"; "inexpressible anguish"; "unspeakable happiness"; "unutterable contempt"; "a thing of untellable splendor". wn #2 ineffable s. [unnameable, unspeakable, unutterable] too sacred to be uttered; "the ineffable name of the Deity". wn