The term "most dirty-dealing" refers to a person who is deceitful, unscrupulous, and dishonest. To find antonyms for this term, we need to look for words that describe a person who is honest, sincere, and trustworthy. Some antonyms for "most dirty-dealing" include straightforward, candid, genuine, sincere, honest, trustworthy, and fair. These words reflect the opposite of a person who engages in underhanded and unethical behavior. Someone who is straightforward and honest is likely to be open and transparent in their dealings, while someone who is trustworthy inspires confidence and reliability. By using antonyms to describe people, we can help to build a more positive and ethical society.