The term "be fouled" generally refers to a situation where something becomes dirty, soiled, or contaminated. The antonyms for this term would be words or expressions that denote the opposite of this state. These may include terms like "clean," "pristine," "pure," "unsoiled," and "untainted." Other possible antonyms may include words like "sterile," "sanitary," "hygienic," "spotless," or "immaculate." In essence, any term that implies a lack of contamination or dirt would serve as an antonym for the phrase "be fouled." Using antonyms is a useful way to clarify the meaning of a sentence or statement, and can help to create a more accurate and nuanced understanding of a text.