#1 dulled s. [benumbed] 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". wn
#2 dulled s. [blunted] made dull or blunt. wn
#3 dulled s. [greyed] deprived of color; "colors dulled by too much sun"; "greyed with the dust of the road". wn
vizzz