Source : Webster's Revised Unabridged Dictionary (1913)

Unmake \Un*make"\, v. t. [1st pref. un- + make.]
   To destroy the form and qualities of; to deprive of being; to
   uncreate.

         God does not make or unmake things to try experiments.
                                                  --T. Burnet.

Source : WordNet®

unmake
     v : deprive of certain characteristics [syn: {undo}] [ant: {do}]
     [also: {unmade}]