Adjectives

(s)shady, shadowed, shadowy, umbrageousfilled 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”
(s)dim, faint, shadowy, vague, wispylacking clarity or distinctness“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”
(s)shadowy, wraithlikelacking in substance“strange fancies of unreal and shadowy worlds” (W.A.Butler), “dim shadowy forms”, “a wraithlike column of smoke”