The Collaborative International Dictionary of English v.0.48:

Unwit \Un*wit"\, v. t. [1st pref. un- + wit.]
   To deprive of wit. [Obs.] --Shak.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Unwit \Un*wit"\, n. [Pref. un- not + wit.]
   Want of wit or understanding; ignorance. [Obs.] --Chaucer.
   [1913 Webster]