Opacity
Verbs
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be opaque etc. adj.
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obstruct the passage of light
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obfuscate, offuscate.
Adjectives
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opaque, impervious to light
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adiaphanous
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dim etc. Dimness
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turbid, thick, muddy, opacous, obfuscated, fuliginous, cloud, hazy, misty, foggy, vaporous, nubiferous, muggy etc. (turbidity) Opacity.Existence. smoky, fumid, murky, dirty.