Yes; "This house has remained unoccupied since the war." is a valid sentence.
You find two unoccupied seats while I get the sodas.
unoccupied
idle
barren.
Idle
Unoccupied.
Yes, the word 'availability' is a noun; a word for a state of being able to be obtained or used; a state of being otherwise unoccupied; a word for a thing.
unoccupied (really not sure just trying to help)
occupied
I'm not sure if there's a major difference price-wise, but usually an unoccupied house is insured by unoccupied home insurance, as opposed to occupied home insurance.
desertedquietdepressedsilenthopeless
alone, by myself