| opaque | (adjective) not transmitting or reflecting light or radiant energy; impenetrable to sight | - |
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| (adjective) hard or impossible to understand | Synonyms: unintelligible |
| opaquely | (adverb) in an opaque manner | - |
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| opaqueness | (noun) the quality of being opaque to a degree; the degree to which something reduces the passage of light | Synonyms: opacity |
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| (noun) incomprehensibility resulting from obscurity of meaning | Synonyms: opacity |
| radiopaque | (adjective) not transparent to X-rays or other forms of radiation | Synonyms: radio-opaque |
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| semiopaque | (adjective) partially opaque | - |
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