past due (adjective) unpaid: not settled; taken without remuneration
Sinonime: extravagant, heedless, imprudent, inconsiderate, lavish, negligent, prodigal, profligate, profuse, reckless, shiftless, shortsighted, thoughtless, thriftless, uneconomical, unthrifty, wasteful
Antonime: careful,
miserly, provident,
thrifty