Synonyms|879Antonyms|229|Broader|13Narrower|49Related|577
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heaviness
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heavyheartedness
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hole in the wall(expression, idiom, light)
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homeplate
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idiocy
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ignominy
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ignorance
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immensity
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immobility
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impenetrability
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importantly
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impurity
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inability
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incomprehensibility
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indistinctness
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ineptness(noun, inability)
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inscrutableness
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intimation
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irritable
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laboriousness
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APASmart Define. (2016). brightness thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/brightness/thesaurus/antonyms
ChicagoSmart Define. 2016. "brightness thesaurus" https://smartdefine.org/brightness/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2016, brightness thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/brightness/thesaurus/antonyms>.
MLASmart Define. "brightness thesaurus" 29 February 2016. Web. 25 September 2026. <https://smartdefine.org/brightness/thesaurus/antonyms>