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adj. shad·i·er, shad·i·est
1. Full of shade; shaded: found a cool, shady spot under some trees. See Synonyms at dark.
2. Casting shade: a large, shady elm.
3. Of dubious character, morality, or legality; questionable: "men who could indulge in any shady deal in downtown offices and still pose as beneficent angels ... on the golf course" (Louis Auchincloss).