Re-paid refers to repaying a debt or refunding a payment, and its opposite is not reimbursing or refunding. Some of the antonyms for re-paid might include terms such as kept, owed, unpaid, or delinquent. While re-paid implies that money has been returned, when someone has not been re-paid, they may have received nothing in return for their payment or may be waiting for payment to be made. In some cases, antonyms for re-paid might also include more specific terms, such as defaulting, insolvency, or foreclosure. Ultimately, the antonyms for re-paid will depend on the specific context of the situation and the relationship between the parties involved.