If something is vacant, it is not being used by anyone.
近义词
empty
双语例句
例：
Halfway down the bus was a vacant seat.
在这辆公共汽车中部有个空座。
2.?空缺的
If a job or position is vacant, no one is doing it or in it at present, and people can apply for it.
双语例句
例：
The position of chairman has been vacant for some time.
主席的职位已经空缺一段时间了。
3.?茫然的
A vacant look or expression is one that suggests that someone does not understand something or that they are not thinking about anything in particular.