"a shady operation"
"a louche nightclub" "a louche painting"
"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"
"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"