unpaid; overdue; in arrears
Refers to a payment that has not been made by its due date, often used in billing, taxes, or membership fees.
Unpaid national pension contributions have become a problem.
未納の会費は来月までにお支払いください。
Please pay the overdue membership fees by next month.
The membership fee is unpaid.
I paid off the outstanding amount all at once.
Leaving insurance premiums unpaid can cause problems.