The phrase "be of another mind" refers to a situation where someone has a different opinion or perspective than someone else. There are several synonyms that can be used to convey this same meaning, including "disagree," "differ," "contradict," "oppose," "diverge," "dissent," and "vary." Each of these words emphasizes the contrast between two viewpoints and the potential conflict that may arise as a result. When communicating with others, it is important to be aware of these synonyms and use them appropriately in order to effectively convey your perspective and understand the perspective of others.