When it comes to expressing that one is in opposition to something else, there are numerous synonyms one could use. Words such as against, contrary, conflicting, resisting, and counter can all convey a sense of opposition. Alternatively, words such as dissenting, differing, divergent, and combating could be used to describe one's stance against something. Additionally, adjectives like antithetical, opposing, hostile, and adversarial can also be used to express a sense of opposition. It is important to note that the context and tone of one's message may dictate which synonym is most appropriate. Ultimately, the goal is to convey a clear and concise message about one's position on a given topic.