The term "double-dealers" refers to people who engage in deceptive or dishonest behavior, typically by pretending to support one side while secretly working against it. Antonyms for this term include the following: honest, straightforward, trustworthy, reliable, loyal, authentic, genuine, forthright, candid, and upright. These words describe individuals who are honest in their actions and intentions, and who do not engage in secret or deceptive behavior. By contrast, double-dealers are often seen as untrustworthy and unreliable, and can cause significant harm to those with whom they interact. Antonyms for double-dealers are essential qualities to look for in individuals, whether in personal or professional relationships.