v. t. [ 1st pref. un- + speak. ] To retract, as what has been spoken; to recant; to unsay. [ R. ] Shak. [ 1913 Webster ]
a. [ Pref. un- not + speakable. ] Not speakable; incapable of being uttered or adequately described; inexpressible; unutterable; ineffable;
Ye rejoice with joy unspeakable and full of glory. 1 Pet. i. 8. [1913 Webster]