The Collaborative International Dictionary of English v.0.48:
Opaqueness \O*paque"ness\, n. The state or quality of being impervious to light; opacity. --Dr. H. More. [1913 Webster]WordNet (r) 3.0 (2006):
opaqueness n 1: incomprehensibility resulting from obscurity of meaning [syn: opacity, opaqueness] 2: the quality of being opaque to a degree; the degree to which something reduces the passage of light [syn: opacity, opaqueness] [ant: clarity, clearness, uncloudedness]