Abounding in shade or shades; overspread with shade; causing shade.
source: Webster 1913
adjective satellite
(of businesses and businessmen) unscrupulous
A shady operation.
source: WordNet 3.0
of questionable taste or morality
A louche nightclub. A louche painting.
source: WordNet 3.0
not as expected
There was something fishy about the accident. Up to some funny business. Some definitely queer goings-on. A shady deal. Her motives were suspect. Suspicious behavior.
source: WordNet 3.0
filled with shade
The shady side of the street. The surface of the pond is dark and shadowed. We sat on rocks in a shadowy cove. Cool umbrageous woodlands.