The Collaborative International Dictionary of English v.0.48:
Shadowiness \Shad"ow*i*ness\, n. The quality or state of being shadowy. [1913 Webster]WordNet (r) 3.0 (2006):
shadowiness n 1: relative darkness caused by light rays being intercepted by an opaque body; "it is much cooler in the shade"; "there's too much shadiness to take good photographs" [syn: shade, shadiness, shadowiness]