The phrase "bad for" implies a negative effect or impact on someone or something. There are numerous synonyms that can be used to convey the same meaning. Some examples of synonyms for "bad for" include detrimental, harmful, damaging, injurious, hazardous, negative, adverse, unhealthy, deleterious, and unwholesome. Each of these words can be used to describe something that has a negative effect on a person's health, well-being, or success. Choosing the appropriate synonym depends on the context and the severity of the situation. Whether it's referring to a food, behavior, or situation, using these synonyms can help to convey the seriousness of the situation.