63 entries under determined topic. ×

6
steadfast(adjective, tough, firm, resolute)
6
unappeasable(adjective, resolute, uncompromising, unshakeable)
5
dogged(adjective, tough, firm, resolute)
5
insistent(adjective, resolute, uncompromising, unshakeable)
5
ossified(adjective, resolute, uncompromising, unshakeable)
5
unshakable(adjective, resolute, uncompromising, unshakeable)
4
bullheaded(adjective, strong, hard, tough, severe)
4
inconvincible(adjective, resolute, uncompromising, unshakeable)
4
pertinacious(adjective, resolute, uncompromising, unshakeable)
4
perverse(adjective, resolute, uncompromising, unshakeable)
4
self-opinionated(adjective, resolute, uncompromising, unshakeable)
4
self-willed(adjective, resolute, uncompromising, unshakeable)
4
wilful(adjective, resolute, uncompromising, unshakeable)
4
willful(adjective, resolute, uncompromising, unshakeable)
3
indurate(adjective, set, firm, stiff)
3
unshakeable(adjective, resolute, uncompromising)
2
resolved(adjective, resolute, uncompromising, unshakeable)
2
unwavering(adjective, resolute, uncompromising, unshakeable)
1
dead set(adjective, resolute, uncompromising, unshakeable)
1
iron-willed(adjective, resolute, uncompromising, unshakeable)
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APASmart Define. (2015). adamantine thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/adamantine/thesaurus/synonyms
ChicagoSmart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
MLASmart Define. "adamantine thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms>