fly-by-night, shady -- ((of businesses and businessmen) unscrupulous; "a shady operation")
louche, shady -- (of questionable taste or morality; "a louche nightclub"; "a louche painting")
fishy, funny, shady, suspect, suspicious -- (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")
shady, shadowed, shadowy, umbrageous -- (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")
(Sound)
