of no value; worthless
Origin of blue-skysee blue-sky law
- a. Not limited by conventional notions of what is practical or feasible; imaginative or visionary: “Proponents of blue-sky thinking often cite the Wright brothers as validation” (David Colman).b. Unrealistic or impractical: “[The author] shows what is testable physics, what is philosophy's domain, and what is blue-sky nonsense” (Ann Finkbeiner).
- or blue-skied Having a cloudless sky; clear: a blue-sky day.
intransitive verbblue-skied, blue-sky·ing, blue-skies
To hold or express unrealistic or impractical views, especially in estimating something.
blue-sky - Computer Definition
See Rayleigh scattering.