Abate: (Of something unpleasant or severe) become less intense or widespread.Aggravate: Make (a problem, injury, or offence) worse or more seriousAllay: Diminish or put at rest (fear, suspicion, or worry).Alleviate: Make (suffering, deficiency, or a problem) less severe.MITIGATE : Make (something bad) less severe, serious, or painful.Antonym of MITIGATE is Aggravate.