1.
If something is ~, it is not being used by anyone.
Half way down the coach was a ~ seat...
= empty
ADJ: usu ADJ n
2.
If a job or position is ~, no one is doing it or in it at present, and people can apply for it.
The post of chairman has been ~ for some time.
ADJ
3.
A ~ look or expression is one that suggests that someone does not understand something or that they are not thinking about anything in particular.
She had a kind of ~ look on her face.
= blank
ADJ
~ly
He looked ~ly out of the window.
ADV: ADV after v