: contaminated by an infective agent (such as a bacterium) and producing pus
But if the patient can manage it, the whirlpool is a dandy way to handle festering bedsores.—Paul G. Donohue
: persisting and growing increasingly bitter over time
… comedy that comes from a pit of festering hatred …—Robert Brustein
: persistently producing bad or unhealthy effects
Four hundred yards to the west, between the schoolhouse and the mountain, lay a festering center of sin, a bootleg whiskey still operated by the celebrated anti-Prohibition guerilla Sam Reever.—Russell Baker
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