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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Related Words for blue skyimpractical, unworkable, improbable, unreal, silly, quixotic, impossible, hallucinatory, whimsical, misleading, false, fantastic, illusory, fanciful, dreamlike, imaginative, fantastical, fictional, preposterous, offbeat
(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