unpaid
I
adjective
due, free, given, gratis, gratuitous, in arrears, outstanding, owing, payable, uncollected, uncompensated, undischarged, unrecompensed, unremunerated, unrequited, unrewarded, unsalaried, unsettled, volunteer
II
index
delinquent (overdue), due (owed), free (at no charge), gratuitous (given without recompense), overdue, payable, receivable, unsettled
Burton's Legal Thesaurus.
William C. Burton.
2006