| crass | |
| darken | |
| difficult(adjective, hard) | |
| dimness | |
| dismal(soft, flat, cold, gloomy, subdued) | |
| dull-witted | |
| elusive | |
| frosted(pale, white, frosty, cloudy, iced) | |
| ill-defined(adjective, dull, dark, gloomy, faint) | |
| ill-lighted(adjective, dull, dark, gloomy, dim) | |
| imperceptive(adjective, dull, hard, obscure, difficult) | |
| impermeable | |
| impervious to light(expression, idiom) | |
| imprecise(adjective, obscure) | |
| incoherent(adjective, obscure) | |
| inconceivable(adjective, unfathomable, impenetrable, unintelligible, puzzling) | |
| inexplicit(adjective, obscure, uncertain, vague, unclear) | |
| inscrutable | |
| invisible | |
| lurid(adjective, dull, dark, gloomy, dim) |
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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> |