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opaque
Opacity or opaque refers to something ifficult to see through or perceive. It can refer to:
Trivia about opaque
Impenetrable to light, like some glass
(Cheryl of the Clue Crew gives the clue.)Because it does not allow light to pass through it, thick nylon, which is not transparent, is described as this from the Latin for "shaded"
If it's not transparent, or even translucent, but quite impenetrable to light, it's this