The Collaborative International Dictionary of English v.0.48:
Disenable \Dis`en*a"ble\, v. t. [Pref. dis- + enable.] To disable; to disqualify. [1913 Webster] The sight of it might damp me and disenable me to speak. --State Trials (1640). [1913 Webster]WordNet (r) 3.0 (2006):
disenable v 1: make unable to perform a certain action; "disable this command on your computer" [syn: disable, disenable, incapacitate] [ant: enable]