-
Unrealistic and impractical: "[The author] shows what is testable physics, what is philosphy's domain, and what is blue-sky nonsense” ( Ann Finkbeiner).
(adjective)
-
Having a cloudless sky; clear: a blue-sky day.
(adjective)
-
To hold or express unrealistic or impractical views, especially in estimating something. Often used with it.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.