WordWeb Online

1. Driven insane
   "She was lured to another woman's apartment and attacked by a deranged, knife-wielding assailant";
   - crazed, half-crazed

1. Throw into great confusion or disorder
   - perturb, throw out of kilter
    
2. Derange mentally, throw out of mental balance; make insane
   "The death of his parents deranged him";
   - unbalance

See also: insane

Type of: craze, disarray, disorder, madden

Encyclopedia: Deranged