| coal(adjective, black) | |
| coaler(adjective, dark, pitch, inky, clouded) | |
| colored | |
| colors | |
| cornelian | |
| crystal | |
| cubic | |
| cubic zirconia(expression, idiom, jewelry) | |
| dense | |
| dirty | |
| disastrous | |
| disgraceful | |
| dispiriting | |
| dumb | |
| dusky(adjective, black) | |
| evil | |
| faint | |
| fatal | |
| fateful | |
| ghastly |
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| APA | Smart Define. (2015). onyx thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/onyx/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "onyx thesaurus" https://smartdefine.org/onyx/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, onyx thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/onyx/thesaurus/synonyms>. |
| MLA | Smart Define. "onyx thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/onyx/thesaurus/synonyms> |