Webster's Revised Unabridged Dictionary · 1913

Unnature

Unnature , transitive verb

[1st pref. un- + nature.]

To change the nature of; to invest with a different or contrary nature. [Obsolete]
A right heavenly nature, indeed, as if were unnaturing them, doth so bridle them [the elements]. — Sir P. Sidney

Unnature , noun

[Prefix un- not + nature.]

The contrary of nature; that which is unnatural. [Rare]
So as to be rather unnature, after all, than nature. — H. Bushnell