Synonyms|302Antonyms|2|Broader|11Narrower|2Related|113
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glum
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granitic
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grim
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grit
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gruff
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guts
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hardihood
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heart
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heart of grace(expression, idiom, courage)
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heart of oak(expression, idiom, courage)
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hector
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immutable
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indefatigability
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indefatigable
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indefatigableness
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inflexible
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intestinal fortitude(expression, idiom, courage)
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irreversible
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long
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man of mettle(expression, idiom, courage)
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APASmart Define. (2015). bulldog thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/bulldog/thesaurus/synonyms
ChicagoSmart Define. 2015. "bulldog thesaurus" https://smartdefine.org/bulldog/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, bulldog thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/bulldog/thesaurus/synonyms>.
MLASmart Define. "bulldog thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/bulldog/thesaurus/synonyms>