Synonyms|65Antonyms|0|Broader|0Narrower|1Related|58
3
iron
1
adamant
1
block
1
board
1
bottom
1
brick
1
cement
1
chutzpah
1
concrete
1
courageous
1
diamond
1
flint
1
granite
1
grit
1
guts
1
heart
1
intestinal fortitude
1
lion
1
marble
1
mettle
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APASmart Define. (2015). heart of oak thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/heart_of_oak/thesaurus/synonyms
ChicagoSmart Define. 2015. "heart of oak thesaurus" https://smartdefine.org/heart_of_oak/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, heart of oak thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/heart_of_oak/thesaurus/synonyms>.
MLASmart Define. "heart of oak thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/heart_of_oak/thesaurus/synonyms>