Coconspirators are individuals who work together to plan and execute a nefarious plot or scheme. The opposite of coconspirators would be individuals who work against each other or have no involvement in the plot. Some antonyms for coconspirators may include allies, adversaries, enemies, foes, rivals, or acquaintances. These are individuals who may have conflicting interests and opposing agendas, making them unlikely to collaborate on a secret plot. In essence, while coconspirators work in tandem, antonyms for this word refer to individuals on opposing sides of an issue or situation.