恶性

malignant;pernicious;vicious;cut-throat
～犯罪案件vicious (or serious) crimes/～竞争cut-throat competition/～螺旋上升vicious spiral/～贫血pernicious anaemia /～事故serious (or fatal)accident/～通货膨胀hyperinflation;galloping (or runaway,malignant) inflation; viciou inflation / ～循环vicious circle/ ～肿瘤malignant tumor;cancer