\Un*na"ture\, v. t. [1st pref. un- + nature.]
To change the nature of; to invest with a different or
contrary nature. [Obs.]
      A right heavenly nature, indeed, as if were unnaturing
      them, doth so bridle them [the elements]. --Sir P.
                                               Sidney.

\Un*na"ture\, n. [Pref. un- not + nature.]
The contrary of nature; that which is unnatural. [R.]
      So as to be rather unnature, after all, than nature.
                                               --H. Bushnell.