There are plenty of ways to express that something is contrary to or in opposition to something else. Some synonyms for "is contrary to" include is in conflict with, opposes, contravenes, goes against, contradicts, belies, challenges, defies, refutes, and repudiates. All these words signal a disagreement or clash between two things, whether they are beliefs, ideas, or actions. It's important to choose the right synonym depending on the context and the level of emphasis that you want to convey. For example, "contravenes" is a more formal and legal-sounding term than "opposes," which is more common and straightforward.