Synonyms|936Antonyms|350|Broader|17Narrower|2Related|1.6k
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heedful
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hefty
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historic
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humorless
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husky
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hustle
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illustrious
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imperative
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imperious
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imposing
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impressive
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in to(expression, open, light)
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indefatigable
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indispensable
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influential
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ingrained
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inherent
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inmost
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innate
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integral
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APASmart Define. (2015). frivolous thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/frivolous/thesaurus/antonyms
ChicagoSmart Define. 2015. "frivolous thesaurus" https://smartdefine.org/frivolous/thesaurus/antonyms (accessed September 29, 2026).
HarvardSmart Define 2015, frivolous thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/frivolous/thesaurus/antonyms>.
MLASmart Define. "frivolous thesaurus" 13 April 2015. Web. 29 September 2026. <https://smartdefine.org/frivolous/thesaurus/antonyms>