There are a variety of synonyms for the phrase "make indifferent or averse." Some examples include: alienate, repel, estrange, disaffect, pall, and bore. These words all convey a sense of turning someone away from a particular thing or person, or causing them to lose interest or enthusiasm. Other possible synonyms could include "dampen," "cool," or "undermine." Essentially, any word or phrase that implies making someone less interested or invested in something could be a potential synonym for "make indifferent or averse." By using different words to express this idea, writers can add nuance and variety to their prose.