Source : WordNet®

desensitize
     v 1: cause not to be sensitive; "The war desensitized many
          soldiers"; "The photographic plate was desensitized"
          [syn: {desensitise}] [ant: {sensitize}, {sensitize}]
     2: make insensitive; "His military training desensitized him"
        [syn: {desensitise}] [ant: {sensitize}]