The antonyms for the term "most polluted" are "least polluted," "cleanest," "purest," "uncontaminated" and "pristine." These words refer to the opposite state of being without any pollution or impurities. Cleanest implies the absence of any dirt or pollutants, while pristine describes a natural state untouched by humans. On the other hand, uncontaminated and purest imply purity and the absence of pollutants or toxins. These opposite terms are important to use when discussing environmental issues and the protection of clean water, air, and land. By understanding antonyms for the term "most polluted," we can better appreciate the importance of a healthy environment.