Synonyms|1.6kAntonyms|240|Broader|29Narrower|279Related|700
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indebtedness
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indigence
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indignant
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inessentiality
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inflexible
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injury
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insubstantiality
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insurgent
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insurrectionary
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invention
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irresoluteness
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jauntiness
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joking
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judgment
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judgment of conviction
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level
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levity
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liabilities
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lightheartedness
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lightness
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APASmart Define. (2015). substance thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/substance/thesaurus/antonyms
ChicagoSmart Define. 2015. "substance thesaurus" https://smartdefine.org/substance/thesaurus/antonyms (accessed September 25, 2026).
HarvardSmart Define 2015, substance thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/substance/thesaurus/antonyms>.
MLASmart Define. "substance thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/substance/thesaurus/antonyms>