The phrase "was of one mind" implies that a group of people are in agreement, united, and have a common understanding. Antonyms for this phrase could include "at odds," "in disagreement," "divided," "conflicted," "disunited," and "dissenting." When people are "at odds," they are in conflict or opposition with one another. "In disagreement" means having a difference of opinion or ideas. "Divided" can describe a group that has conflicting opinions or is separated by a disagreement. "Conflicted" means being torn between two opposing ideas. "Disunited" describes a group that lacks unity, agreement, or a shared purpose. "Dissenting" signifies a group of people who disagree with the majority opinion or decision.