Big-rich is a phrase used to describe someone who is extremely wealthy and successful. However, there are many synonyms that can be used to convey this same meaning. For example, one might use the terms affluent, prosperous, or even opulent to describe someone who is big-rich. Other synonyms might include wealthy, prosperous, or even multimillionaire. Depending on the context, different words might be used to describe someone who is extremely wealthy and successful but, ultimately, they all mean the same thing. Whatever word one chooses, the implication is clear: the person in question has amassed a great deal of wealth and is likely living a very comfortable life.