unpaid

同义词：

outstanding | due | owing | amateur | voluntary | honorary | free | unsettled | overdue | in arrears | recreational | volunteer |

反义词：

paid |

词义辨析：

同义:

a.亏欠的; 未付的

owing

due

outstanding

反义:

a.未缴纳的; 无报酬的

paid

反义参见:

paid²