Un*speak"a*bly

from The Collaborative International Dictionary of English v.0.48

Unspeakable \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.
   [1913 Webster]

         Ye rejoice with joy unspeakable and full of glory. --1
                                                  Pet. i. 8.
   [1913 Webster]