Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Unrealistic and impractical: "[The author] shows what is testable physics, what is philosphy's domain, and what is blue-sky nonsense” ( Ann Finkbeiner).
  • adj. Having a cloudless sky; clear: a blue-sky day.
  • intransitive v. To hold or express unrealistic or impractical views, especially in estimating something. Often used with it.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Alternative form of blue-skies.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. without immediate commercial value

Etymologies

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