(make dull in appearance; "Age had dulled the surface")
(become dull or lusterless in appearance; lose shine or brightness; "the varnished table top dulled with time")
(deaden (a sound or noise), especially by wrapping)
(make numb or insensitive; "The shock numbed her senses")
(make dull or blunt; "Too much cutting dulls the knife's edge")
(become less interesting or attractive)
(make less lively or vigorous; "Middle age dulled her appetite for travel")
(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")
(made dull or blunt)
(deprived of color; "colors dulled by too much sun"; "greyed with the dust of the road")