The word "riproaring" is often used to describe something that is loud, boisterous, and exciting. However, there are several antonyms that can be used to describe something much quieter, calmer, and more subdued. Some possible antonyms for "riproaring" might include words like "peaceful," "quiet," "serene," "gentle," "mellow," or "subdued." These words all suggest a sense of tranquility or calm, and can be used to describe a variety of situations or experiences that are the opposite of a riproaring good time. Whether you're looking for something peaceful and calming or something loud and exciting, there are plenty of antonyms to choose from when describing your experiences.