Un‐speak″a‐ble (?), a. [Pref. un- not + speakable.] Not speakable; incapable of being uttered or adequately described; inexpressible; unutterable; ineffable; as, unspeakable grief or rage. — Un‐speak″a‐bly, adv.
Ye rejoice with joy unspeakable and full of glory. 1 Pet. i. 8.