rampant [ˈræmpənt]

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adj.(植物)蔓生的；狂暴的，无约束的

(of something bad ) getting worse quickly and in an uncontrolled way

Sickness was rampant in the area. 该地区疾病蔓延。
You cannot allow children to be rampant through the museum. 你不能任由小孩子在博物馆里乱跑。