12 entries under unyielding topic. ×

30
unbreakable(adjective, strong, tough, firm, rigid)
27
impenetrable(adjective, firm, rigid, steely)
21
tough(adjective, firm, rigid, steely)
20
adamantine(adjective, firm, rigid, steely)
20
rock-hard(adjective, firm, rigid, steely)
19
flinty(adjective, firm, rigid, steely)
6
hard(adjective, strong, firm, rigid)
5
adamant(adjective, firm, rigid, steely)
5
impregnable(adjective, unassailable, untouchable, unconquerable)
5
steely(adjective, firm, rigid)
5
stony(adjective, firm, rigid, steely)
4
rocky(adjective, firm, rigid, steely)
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APASmart Define. (2015). indestructible thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/indestructible/thesaurus/synonyms
ChicagoSmart Define. 2015. "indestructible thesaurus" https://smartdefine.org/indestructible/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2015, indestructible thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/indestructible/thesaurus/synonyms>.
MLASmart Define. "indestructible thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/indestructible/thesaurus/synonyms>