The word "Against" is a commonly used preposition that denotes opposition or resistance to something. However, there are several other synonyms that can be used in place of it to express a sense of encountering or facing something. Some of these synonyms include "opposed to", "contrary to", "at odds with", "antagonistic towards", "adverse to", "resistant to", "defiant towards", "repugnant to", "hostile to", and "in conflict with". Each of these synonyms carries unique nuances that can be used to convey subtle differences in meaning. Thus, knowing these synonyms can help you communicate your ideas more effectively and make your writing more concise and compelling.