dulled in WordNet English dictionary

1. having lost or been caused to lose interest because of overexposure
   "the mind of the audience is becoming dulled"; "the benumbed intellectual faculties can no longer respond"
   dulled  benumbed 
   
2. made dull or blunt
   blunted  dulled 
   
3. deprived of color
   "colors dulled by too much sun"; "greyed with the dust of the road"
   dulled  greyed 
   

dulled in English Wiktionary