Back debts are an all too common problem for many people and businesses these days. And while it can be frustrating to deal with overdue bills and payments, it's important to remember that there are plenty of synonyms out there to help you express this concept in different, more descriptive ways. Some common alternatives to "back debts" might include things like unpaid expenses, overdue accounts, outstanding balances, delinquent bills, or even arrears. Whatever you choose to call it, the key is to be clear and direct about what you owe and how you plan to settle your debts in the future.