Synonyms for unpaid

modified

1. Owed; said of debts

   due, payable, not discharged, past due, overdue, delinquent, unsettled, unliquidated, undefrayed, outstanding.

   Antonyms paid*, discharged, defrayed.

2. Not reimbursed; said of creditors

   due, uncompensated, unindemnified, unrewarded, defrauded, unsalaried, unfed.

   Antonyms paid*, reimbursed, indemnified.

3. Working without salary

   voluntary, volunteer, unsalaried, amateur, freewill, donated, contributed, pro bono.