The phrase "runs amuck" refers to wild or uncontrolled behavior, but there are several opposite or antonyms that could be used in its place. Instead of running amuck, one could be described as being calm, collected, or composed. The opposite of wild behavior can also be controlled, disciplined, and orderly. Rather than running amuck, one could be said to be following rules, obeying orders, or behaving responsibly. When someone tames their wild impulses and emotions, they display stability or steady demeanor. Ultimately, the antonyms of running amuck represent a sense of control, discipline, and rationality that stands in direct opposition to uncontrolled behavior.