When you want to describe someone living in comfortable circumstances, you can use a variety of synonyms to convey the same meaning. Instead of saying that someone is living in comfortable circumstances, you can say that they are living in a state of ease, enjoying prosperity, or living in affluence. Another way to describe someone living in comfort is to use phrases like "living the good life" or "living in luxury." However, it's important to note that these synonyms may not always carry the exact same connotations as the original phrase, so it's important to use them in context.