The phrase "more extreme" can be replaced with several synonyms, depending on the context. For instance, if one wants to emphasize the severity of a situation, they could use words like "intense," "severe," or "acute." Another way to convey the idea of more extreme would be to use words such as "radical," "drastic," or "profound." Additionally, synonyms like "unprecedented," "unmatched," or "unconventional," can be used to describe situations or events that are beyond the norm. In essence, the use of different synonyms for "more extreme" can help convey the intended meaning, making language more nuanced and interesting.