The word "most rampaging" implies violence, chaos, and destruction. Therefore, possible antonyms for this phrase would be words that convey peace, tranquillity and serenity. These could include terms such as peaceful, calm, gentle, placid, and serene. When looking for antonyms for "most rampaging," it is important to consider the context and the sentiments that the writer wishes to convey. By using more appropriate words, the writer can create a better impression on the reader while avoiding misunderstandings. Regardless of the words chosen, it's essential to maintain consistency in the tone, mood and context of the text.