Synonyms|936Antonyms|350|Broader|17Narrower|2Related|1.6k
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flinty
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focal
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forbidding
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forceful
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forlorn
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frightened
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frightful
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germane
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gigantically
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gingerly
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gloom
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gloominess
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gluttonous
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greater
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grownup
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gruff
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hard
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hardboiled(upset, light)
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hardened
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hardworking
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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>