形容词

1. （犯罪）猖獗的；（疾病）蔓延的
If you describe something bad, such as a crime or disease, as rampant, you mean that it is very common and is increasing in an uncontrolled way.

1. (of a plant) having a lush and unchecked growth

e.g. a rampant growth of weeds

2. unrestrained and violent

e.g. rampant aggression