The Collaborative International Dictionary of English v.0.48:
Unmake \Un*make"\, v. t. [1st pref. un- + make.] To destroy the form and qualities of; to deprive of being; to uncreate. [1913 Webster] God does not make or unmake things to try experiments. --T. Burnet. [1913 Webster]WordNet (r) 3.0 (2006):
unmake v 1: deprive of certain characteristics [syn: unmake, undo] [ant: do, make]