Answer: festered

AnswerCrossword Clue
FESTEREDRankled.
FESTEREDRankled
FESTEREDRotted
FESTEREDDecayed
FESTEREDBecame much worse
festeredFESTER, to generate pus
festeredmake inflamed or corrupt
festeredto generate pus
festeredundergo or exist in a state of progressive deterioration allowed slums to fester
festeredcause increasing poisoning, irritation, or bitterness rankle dissent festered unchecked