Plain dealing is a term that describes honesty, transparency and straightforwardness in behavior. There are several synonyms that can be used to express the same idea, such as integrity, sincerity, forthrightness, honesty, candor, openness, and directness. These words emphasize the importance of being upfront and honest in one's dealings with others. Other synonyms for plain dealing include frankness, fairness, impartiality, and justness. All of these terms describe behavior that is free from deceit or trickery and is guided by moral principles. Using synonyms for plain dealing can add variety to your language and help you express yourself more clearly and effectively.