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English definition of “opaque”

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opaque

adjective [not gradable]  /oʊˈpeɪk/ us  
(of a substance) preventing light from traveling through, and therefore not allowing you to see through it: opaque watercolors Opaque also means difficult to understand: The majority of readers found his poetry difficult, even opaque.
(Definition of opaque from the Cambridge Academic Content Dictionary © Cambridge University Press)
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