"At variance" is a common phrase used to describe a disagreement or conflict between two or more individuals or groups. There are several synonyms for this phrase that can be used to convey similar meanings. For example, "incompatible" suggests that two things are unable to exist together harmoniously. "Contradictory" is another synonym that denotes conflicting statements, actions, or beliefs. "Opposing" is a term that conveys two parties being in direct opposition with one another, while "conflicting" denotes two things that cannot coexist without causing tension or discord. Overall, choosing the appropriate synonym depends on the context and the level of disagreement being communicated.