desensitization
noun /diːˌsensətaɪˈzeɪʃn/
  /diːˌsensətəˈzeɪʃn/
(British English also desensitisation)
 [uncountable]- desensitization (to something) the process or fact of becoming less aware of something as a problem by becoming used to it- viewers' desensitization to on-screen violence
 
- (specialist) the process of treating somebody/something so that they will stop being sensitive to physical or chemical changes, or to a particular substance- allergy desensitization