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.