adjective
vacant
VAY-kunt/ˈveɪkənt/
Not currently occupied or filled.
The chair beside the bare desk is currently vacant.

Etymology
The participial formation describes something as being empty. An office can be vacant because nobody holds it, just as a house or room can be vacant because nobody occupies it.
In context
The house belonged to my mother-in-law and she got married and moved. So, the house was sitting vacant.
More examples
- The upstairs apartment remains vacant while the owner repairs it.
- Two positions on the school board are vacant.
- He gives me a vacant stare instead of answering.
Forms
vacant
vacancy noun — An unoccupied space or available position.
vacantly adverb — Without showing thought, interest, or expression.