The antonyms for the term "unlimited rules" can be limited, restricted, bounded or contained regulations. Rules that have specific constraints, clear boundaries or offer only a certain amount of freedom can often be viewed as the opposite of unrestricted or boundless regulations. Limited rules are often established to ensure ethical and lawful practices, providing structure and consistency in various settings such as in schools, businesses, or sports. However, it is important to note that the effectiveness and efficiency of any set of rules depend on several factors, including their clarity, relevance and flexibility, among others, which can vary depending on the context or purpose they serve.