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

Origin of blue-sky

First recorded in 1890–95 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for blue-sky

Contemporary Examples of blue-sky

Historical Examples of blue-sky

  • Turn a perfectly sound, entrenched business into a blue-sky factory?

    The Big Tomorrow

    Paul Lohrman

  • Snubbed for the first time in all her blue-sky life–and by a boy, too!

    Pemrose Lorry, Camp Fire Girl

    Isabel Katherine Hornibrook

  • The bluest skies of a blue-sky land curved in fathomless majesty over the yellow valley of the Santa Fé.

    Vanguards of the Plains

    Margaret McCarter

  • There are some business men who look upon psychology as "blue-sky" theorizing or "new thought."

  • The blue-sky during all these centuries has tinged the shadows outdoors a bluish color.

    Visual Illusions

    Matthew Luckiesh

British Dictionary definitions for blue-sky




(modifier) of or denoting theoretical research without regard to any future application of its resulta blue-sky project

verb -skies, -skying or -skied

to theorize (about something that may not lead to any practical application)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012