There are several synonyms for the phrase "don't encourage someone" that can be used to convey a similar message. One such synonym is to dissuade someone, which means to deter or discourage them from pursuing a certain action or behavior. Another synonym for "don't encourage someone" is to discourage them, which involves putting forth an effort to prevent someone from doing something that could lead to negative consequences. Additionally, the phrase "don't enable someone" can also be used as a synonym for not providing encouragement, as enabling involves facilitating or supporting someone in their negative actions or behaviors.