What is the meaning of shadowy?

adjective

• 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: shady, shadowed, umbrageous
• Lacking clarity or distinctness.
  • usage: "a dim figure in the distance"; "only a faint recollection"; "shadowy figures in the gloom"; "saw a vague outline of a building through the fog"; "a few wispy memories of childhood"
  • synonyms: dim, faint, vague, wispy
• Lacking in substance.
  • usage: "strange fancies of unreal and shadowy worlds- W. A. Butler; "dim shadowy forms"; "a wraithlike column of smoke"
  • synonyms: wraithlike