adjective
1.
serving without pay
a charity manned by unpaid assistants
Synonyms: uncompensated, unrecompensed, unremunerated
Related Word: freewill, gratuitous, voluntary, volunteer
Contrasted words: compensated, recompensed, remunerated
Antonyms: paid
2.
not cleared by payment
an unpaid bill
Synonyms: due, mature, outstanding, overdue, owing, payable, unsettled
Idioms: in arrears
Contrasted words: cleared, discharged, liquidated, settled
Antonyms: paid