"Not paid" is a term used to describe an individual or organization that has failed to receive payment for a product or service. There are several synonyms to describe this term such as "unpaid", "outstanding payment", "overdue payment", "defaulted payment", "delinquent payment", and "nonpayment". These synonyms are commonly used in legal and financial transactions to indicate that a payment is still owed. Failure to pay can result in legal action or damage to a company's credit score. Therefore, it is important for both parties to ensure that they fulfill their payment obligations and keep track of their financial records.