When expressing opinions or thoughts, it's common to use phrases such as "on the negative side" to convey a negative aspect of a certain topic. However, as language is constantly evolving, there are numerous synonyms that can be used in place of this phrase. For instance, you can use "on the downside," "to the detriment of," "unfortunately," "regrettably," or "in a negative light." These alternatives serve to add variety and richness to your language, and avoid repetition. Whether you're writing an essay, a report, or a speech, incorporating these synonyms can greatly enhance your message and impact.