if a job or position is unfilled, nobody has been chosen for it （职位）空缺的 There are thousands of unfilled vacancies in the nation's schools. 全国的学校有数千个空缺。
- (especially North American English)
if an order for goods is unfilled, the goods have not been supplied （订单）未交货的 There is a backlog of unfilled orders to deal with. 尚有待处理的未完成订单积压。
if a break in a conversation is unfilled, nobody speaks （谈话中）停顿的