Unpaid debt, also known as ARREARS, is a term used to describe money that is owed but has not yet been paid. ARREARS can refer to any type of debt, such as rent, taxes, or loans. The term 'ARREARS' is derived from the Latin word 'arrerare, ' which means 'to be behind.' The crossword solutions for the term 'unpaid debt' are ARREARS (7 letters), ARREA (5 letters), and ARREAR (6 letters). All three terms refer to the same concept of unpaid debt.