| inky(adjective, dull, dark, gloomy, dim) | |
| mat(adjective, dull, dark, gloomy, faint) | |
| Greek(incoherent, unfathomable, incomprehensible, impenetrable, unintelligible) | |
| addled | |
| adiaphanous | |
| alabaster(pale, white, frosty, cloudy, iced) | |
| ashen(adjective, soft, obscure, flat, dark) | |
| asinine | |
| beats me(expression, unfathomable, impenetrable, unintelligible, puzzling) | |
| becloud | |
| beef-brained | |
| beef-witted | |
| bemired | |
| bespattered | |
| beyond comprehension(expression, unfathomable, impenetrable, unintelligible, puzzling) | |
| birdbrained | |
| black out | |
| blacken | |
| blackness | |
| bleary(adjective, dull, light, obscure, dark) |
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| APA | Smart Define. (2016). opaque thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/opaque/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "opaque thesaurus" https://smartdefine.org/opaque/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, opaque thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/opaque/thesaurus/synonyms>. |
| MLA | Smart Define. "opaque thesaurus" 29 February 2016. Web. 23 September 2026. <https://smartdefine.org/opaque/thesaurus/synonyms> |