The phrase "becomes tainted" implies that something once pure or innocent has turned into something contaminated or corrupted. Antonyms for this phrase could include "remains pure," "stays untainted," or "keeps its integrity." These words describe objects or people that have resisted corruption or maintained their original state. Other antonyms could include "evolves positively," "gains purity," or "becomes sanctified," suggesting a transformation from a negative state to a positive one. Ultimately, the opposite of "becomes tainted" is to remain unaffected, uncorrupted, and unchanged. Therefore, it is essential to protect the goodness of people, objects, and environments to prevent them from becoming tainted.