obscurity (part of speech: noun)
- It is not at all surprising that in later times we should find an opaqueness to have obscured the clear crystal of these subtle perceptions, for fear and pity have no longer the same ascendancy in a busy world. - "A Cursory History of Swearing", Julian Sharman.
- Their voices out in the white opaqueness sounded strangely under the sounding- board of the fog. - "Joan of Arc of the North Woods", Holman Day.
- The beauty of a stone may arise from its color or lack of color, from its translucency or opaqueness, from its high refraction of light, and from the manner of cutting and polishing to bring out these qualities. - "The Economic Aspect of Geology", C. K. Leith.