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Meaning:
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not allowing light to pass through; that cannot be seen through

clouded, muddy

blurred cloudy dirty dull frosty gloomy hazy impenetrable murky thick dark darkened dim dusky filmy foggy fuliginous lusterless misty muddied nontranslucent nontransparent nubilous obfuscated shady smoky sooty turbid
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Cases of word usage

1) the quality of being opaque (opacity)

OPAQUE as in Wiktionary
OPAQUE as in Wikipedia