What is the meaning of shady?

adjective

• Of businesses and businessmen. ( unscrupulous)
  • usage: "a shady operation"
  • synonyms: fly-by-night
• Of questionable taste or morality.
  • usage: "a louche nightclub"; "a louche painting"
  • synonyms: louche
• Not as expected.
  • usage: "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"
  • synonyms: fishy, funny, suspect, suspicious
• Filled with shade.
  • usage: "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"
  • synonyms: shadowed, shadowy, umbrageous