meliorate Antonyms

do damage prevent obstruct mar lower lessen labefy injure impoverish impair hurt hinder harm halt reduce ruin add to the problem add fuel to the fire vandalize screw up break down worsen weaken vitiate upset undermine stop spoil sink frustrate flaw exacerbate deface decrease decline debase damage corrupt claw break blow block blight blighted blemish degrade demolish euchre endamage empoison