vacant

1. ADJ If something is vacant, it is not being used by anyone. 空着的

Halfway down the bus was a vacant seat. 这辆公共汽车中部有个空座。

2. ADJ If a job or position is vacant, no one is doing it or in it at present, and people can apply for it. 空缺的

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. ADJ 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. 茫然的

She had a kind of vacant look on her face. 在她脸上有一种茫然的表情。

4. vacantlyADV 茫然地[ADV after v]

He looked vacantly out of the window. 他茫然地望着窗外。