The term 'befoul' means to pollute, contaminate, or soil. It is often used to describe something that has been made dirty or impure. Antonyms of 'befoul' include purify, clean, sanitize, and detoxify. If something has been befouled, it can be restored to its original state by the use of these antonyms. Purify means to make something pure, free from contamination or impurities, while clean means to make something free from dirt or grime. Sanitize is to make something hygienic, and detoxify refers to removing any toxic elements or chemicals from a substance. All these antonyms serve as a solution to the unpleasantness of the word 'befoul.