The word "became tainted" refers to something that has been spoiled or contaminated in some way. Its antonyms would include words like "purified," "cleansed," "disinfected," or "sterilized." Each of these words suggests the removal of impurities or harmful elements, leaving something pure and safe. Other antonyms could include words like "restored," "renewed," or "revitalized," which suggest the process of returning something to its original state or improving upon it. The opposite of becoming tainted is about restoring and rejuvenating, creating something that is fresh, clean, and healthy. By using these positive antonyms, we can focus on the process of transforming something for the better.