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.

 

© Webster 1913.