unfilled

形容词 unfilled:

1. of purchase orders that have not been filled

1. Something canceled, especially a released accommodation or an unfilled appointment.
   撤消被撤消的事物，尤指被放弃的住房或未履行的约会
2. An accumulation, especially of unfinished work or unfilled orders.
   积压堆积物，尤指没完成的工作或未兑现的定单