Longman Dictionary of Contemporary English
Douglas Harper's Etymology Dictionary
Wiktionary
a. Not available n. (context US history English) A communist who operated underground and was therefore not available for a political leadership position.
WordNet
adj. not available or accessible or at hand; "fresh milk was unavailable during the emergency"; "his secretary said he was unavailable for comment" [ant: available]
Usage examples of "unavailable".
Except for a specialist reissue in a tiny edition, these stories have been unavailable since they first appeared in fiction magazines a hundred years ago.
When he asked for Gutterman, he was put on hold and then told he was in a meeting and unavailable.
Christopher had just begun to tell his story to Joel Cassinger when Cassinger was interrupted and informed that Louis Albergetti, the head of national security, who just happened to be at a conference in Arizona, would be in the office momentarily, accompanied by Charles Gutterman, the California head of security who was unavailable at the time Christopher had first phoned their office.
Flora a kiss in the air an inch off her cheek and looked vaguely at my sling, finding like Orkney that hands unavailable for shaking left goodbyes half unsaid.
The tower link is unavailable, said Bug, due to overextension of the houseputer processors.
Many of the old ship files were locked with long-forgotten military passwords and thus unavailable to members of the Guild.
It would seem that users will not pay for content unless it is unavailable elsewhere or qualitatively rare or made rare.
How is it, I ask myself, that channellers never give us verifiable information otherwise unavailable?
Surprisingly, the data on that earlier effort was unavailable even to the participants on the panel.
He started to apologize that Siri Teku's crew was on day shift and would be unavailable right now, then stumbled to a halt as he decided that Siri Teku wouldn't have been fool enough to send a pretty piece like that baby girl Below.
Still, since no life can completely defend itself from the unforeseen, it was evident that all Boyne's precautions would sooner or later prove unavailable, and Mary concluded that he had cut short a tiresome visit by walking with his caller to the station, or at least accompanying him for part of the way.
The death toll from accidental drowning is the highest ever recorded and food is now unavailable in many districts.
Beans were unavailable, having been harvested and gathered in by the mages the month before, so he used small stones approximately the right size, and pretended to squeeze them.
With communications back online, Marlowe once again tried to contact Ices, but she was still unavailable.
In a way, he'd walked out on me, although I'd been in utero and therefore unavailable for good-byes.