| milky(adjective, white, cloudy) | |
| mysterious | |
| mystifying(adjective, unfathomable, impenetrable, unintelligible, puzzling) | |
| nubilous(adjective, hard, gloomy, gray, dense) | |
| obscured(adjective, dull, dark, gloomy, faint) | |
| recondite | |
| shapeless(adjective, obscure) | |
| slow | |
| sooty(adjective, dull, soft, obscure, flat) | |
| stolid(adjective, dull, insensitive, simple-minded, dull-witted) | |
| stupid | |
| thickheaded | |
| dumb(adjective, dull, silly, foolish, stupid) | |
| amphibological(adjective, hard) | |
| aphotic(adjective, dull, dark, gloomy, dim) | |
| backward | |
| caliginous(adjective, dull, dark, gloomy, dim) | |
| clear as mud(expression, idiom, unfathomable, impenetrable, unintelligible) | |
| cloddish | |
| close(adjective, set, solid, heavy, deep) |
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| APA | Smart Define. (2016). opaque thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/opaque/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "opaque thesaurus" https://smartdefine.org/opaque/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2016, opaque thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/opaque/thesaurus/synonyms>. |
| MLA | Smart Define. "opaque thesaurus" 29 February 2016. Web. 22 September 2026. <https://smartdefine.org/opaque/thesaurus/synonyms> |