adjective. Not available, accessible, or at hand.

Not available; not capable of being used with advantage: as, unavailable manuscripts.

Useless; vain.

adjective. Not available

noun. A communist who operated underground and was therefore not available for a political leadership position.

adjective. not available or accessible or at hand

"If a publisher tells them to not discount a book, Amazon will simply declare the title unavailable, or uncertain, even when it is available and certain."