Shady \Shad"y\, a. [Compar. Shadier; superl. Shadiest.]

1. Abounding in shade or shades; overspread with shade; causing shade.

The shady trees cover him with their shadow. --Job. xl. 22.

And Amaryllis fills the shady groves. --Dryden.

2. Sheltered from the glare of light or sultry heat.

Cast it also that you may have rooms shady for summer and warm for winter. --Bacon.

3. Of or pertaining to shade or darkness; hence, unfit to be seen or known; equivocal; dubious or corrupt. [Colloq.]

``A shady business.'' --London Sat. Rev.

Shady characters, disreputable, criminal. --London Spectator.

On the shady side of, on the thither side of; as, on the shady side of fifty; that is, more than fifty. [Colloq.]

To keep shady, to stay in concealment; also, to be reticent. [Slang]

Source: Webster's Revised Unabridged Dictionary (1913)