The quality or state of being opaque or not allowing light to pass through.
Derived from 'adiaphanous' by adding the suffix '-ness,' which converts an adjective into an abstract noun representing the quality or condition described by that adjective.
Abstract nouns ending in '-ness' are how English lets us talk about qualities as if they were things—like how 'happiness' is the quality of being happy, 'adiaphanousness' is the quality of being light-blocking and opaque.
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