Noun
thin air (uncountable)
(idiomatic, figuratively, usually humorous) An unknown location.
Stock market bubbles don't grow out of thin air. They have a solid basis in reality, but reality as distorted by a misconception. George Soros
...the more accurate the calculations became, the more the concepts tended to vanish into thin air. Robert S. Mulliken
He [Death] pulled a pure-black iPad from thin air. Death tapped the screen a few times and all Frank could think was: Please don't let there be an app for reading souls. Rick Riordan
I've found that worry and irritation vanish into thin air the moment I open my mind to the many blessings I possess. Dale Carnegie
They too, like so much that to the common eye seems solid, may melt into air, into thin air. James Frazer
The sections of the Bill dealing with amnesty were not plucked out of thin air. They have been taken from legislation adopted and successfully used elsewhere. The principles of amnesty are well known and accepted internationally. We have done the research on this. Laisenia Qarase