fanciful; impractical:
blue-sky ideas.
(especially of securities) having dubious value; not financially sound:
a blue-sky stock.
Contemporary Examples

Handcuffs, Ropes, and an Open Window: How I Escaped an Unthinkable Childhood Genyfer Spark January 28, 2012
Choking Back Tears, Thousands of Cops Honor Fallen Officer Ramos Michael Daly December 27, 2014
The Ballad of Johnny France Richard Ben Cramer January 11, 2014
Benedict Cumberbatch’s Revealing Reddit AMA: On Julian Assange’s Letter and Fame Marlow Stern October 10, 2013
Reinventing the News Business Michael Mendenhall September 29, 2010

Historical Examples

Under the Maples John Burroughs
The Wild Man of the West R.M. Ballantyne
Journals of Dorothy Wordsworth, Vol. I (of 2) Dorothy Wordsworth
The Civilization of Illiteracy Mihai Nadin
The Adventures of Reddy Fox Thornton W. Burgess

(modifier) of or denoting theoretical research without regard to any future application of its result: a blue-sky project
verb -skies, -skying, -skied
to theorize (about something that may not lead to any practical application)

Speculation; guesswork: That may sound great, but it’s just blue sky (1980s+)
Heroin: ex-psychiatric case from Bellevue with a minor in blue sky and toot (1980s+ Narcotics)


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