The phrase "is cahoots" suggests a sense of collaboration or partnership between two or more parties. Antonyms that express the opposite of this idea include "opposition," "antagonism," "competition," "discord," and "disagreement." These words indicate that there is a lack of agreement or alignment between parties, who may be working against each other, competing for the same resources, or simply unable to work together effectively. Rather than cooperating for a common goal, they are in conflict or working at cross purposes. By understanding and using antonyms for "is cahoots," we can more clearly describe relationships among individuals and groups who do not share common interests or goals.