- opacity, opaqueness - incomprehensibility resulting from obscurity of meaning
--1 is a kind of incomprehensibility
- opacity, opaqueness - the quality of being opaque to a degree; the degree to which something reduces the passage of light
--2 is a kind of quality
--2 has particulars:cloudiness, murkiness, muddiness; indistinctness, blurriness, fogginess, fuzziness