If you do unpaid work or are an unpaid worker, you do a job without receiving any money for it.
Even unpaid work for charity is better than nothing.
即便是无偿的慈善工作也好过没事可做。
Unpaid taxes or bills, for example, are taxes or bills which have not been paid yet.
millions of dollars in unpaid taxes.
数百万美元的未付税款。