The term "be fouling" implies something that is dirty, contaminated, or tarnished. Therefore, the antonyms for this word would be clean, pure, and pristine. These words refer to something that is completely free from dirt, grime, or contamination. Additionally, synonyms for antonyms of "be fouling" could include words like wholesome, unblemished, and immaculate. These words can be used to describe anything from a person's reputation to the environment around us. It is important to understand the various antonyms for "be fouling" so that we can describe things accurately and effectively in our speech and writing.