60 entries under sturdy topic. ×

15
unyielding(adjective, set, strong, hard, tough)
14
stubborn(adjective, strong, hard, tough, difficult)
14
firm(noun, adjective, strong, hard, tough)
13
staunch(adjective, strong, firm, determined, steady)
12
strong(adjective, hard, great, tough, firm)
12
tenacious(adjective, strong, tough, firm, difficult)
8
relentless(adjective, strong, hard, tough, determined)
7
inflexible(adjective, set, strong, hard, tough)
5
hard(adjective, set, strong, great, tough)
5
inexorable(adjective, strong, hard, tough, resolution)
5
tough(adjective, strong, hard, great, difficult)
4
rigid(adjective, strong, hard, tough, persistent)
3
bullheaded(adjective, strong, hard, tough, difficult)
3
hard-line(adjective, strong, hard, tough, difficult)
3
obdurate(adjective, strong, hard, tough, difficult)
3
strict(adjective, strong, hard, tough, resolute)
3
vigorous(adjective, strong, powerful, determined, noble)
2
adamant(adjective, strong, hard, tough, determined)
2
hard-shell(adjective, strong, hard, tough, persistent)
2
immovable(adjective, strong, hard, tough, difficult)
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APASmart Define. (2015). indomitable thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/indomitable/thesaurus/synonyms
ChicagoSmart Define. 2015. "indomitable thesaurus" https://smartdefine.org/indomitable/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, indomitable thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/indomitable/thesaurus/synonyms>.
MLASmart Define. "indomitable thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/indomitable/thesaurus/synonyms>