Answer: dulled

AnswerCrossword Clue
DULLEDBecame less keen
DULLEDMade less sharp
DULLEDMade dim.
DULLEDTook the edge off
DULLEDLike overused razors
dulledMake or become dull or less intense
dulledDULL, to blunt (to make dull)