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Webster 1913 Edition

Adj.

Like the sky; ethereal; being in the sky.

“Skyey regions.”

Thackeray.

Sublime on the towers of my

skyey

bowers,
Lightning, my pilot, sits.

Shelley.

Adj.

Like the sky; etherial.

skyey ‎(comparative more skyey, superlative most skyey)

(poetic) Resembling the sky.
- H. P. Lovecraft, The Colour out of Space
  When twilight came I had vaguely wished some clouds would gather, for an odd timidity about the deep skyey voids above had crept into my soul.
(informal) Of or relating to the sky.
(informal) In the sky.

very informal: of or relating to the sky

very informal: in the sky