| unintelligent | |
| blank | |
| cheerless(adjective, unhappy, depressing) | |
| harsh(calm, soft, low) | |
| night | |
| sad(adjective, happy, joy, glad, merry) | |
| depressed | |
| blue | |
| foul | |
| leaden | |
| pessimistic(adjective, feelings, emotions, optimistic) | |
| shadowy(adjective, distinct, hazy) | |
| stupid(adjective, sharp, intelligent) | |
| sullen(adjective, upset, brooding) | |
| threatening | |
| boring | |
| colorless | |
| dumb(adjective, sharp, stupid, unintelligent) | |
| glum(adjective, cheerful) | |
| hopeless(adjective, pessimistic, futile) |
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| APA | Smart Define. (2016). bright thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/bright/thesaurus/antonyms |
| Chicago | Smart Define. 2016. "bright thesaurus" https://smartdefine.org/bright/thesaurus/antonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2016, bright thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/bright/thesaurus/antonyms>. |
| MLA | Smart Define. "bright thesaurus" 31 March 2016. Web. 23 September 2026. <https://smartdefine.org/bright/thesaurus/antonyms> |