desensitise

from WordNet (r) 3.0 (2006)

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

from The Collaborative International Dictionary of English v.0.48

desensitise \desensitise\ v. t.
   same as {desensitize}.

   Syn: deaden.
        [WordNet 1.5]