56 entries under unshakeable topic. ×

10
stern(adjective, determined, resolute, uncompromising)
10
stiff(adjective, set, firm, harsh, determined)
8
fixed(adjective, tough, severe, determined, resolute)
8
obstinate(adjective, cruel, determined, resolute, pitiless)
8
set(adjective, severe, firm, harsh, determined)
7
hardheaded(adjective, strong, hard, tough, firm)
7
pat(adjective, determined, resolute, uncompromising)
7
unforgiving(adjective, determined, resolute, uncompromising)
6
mulish(adjective, strong, hard, tough, firm)
6
pigheaded(adjective, tough, determined, resolute, stubborn)
6
stiff-necked(adjective, strong, hard, tough, firm)
6
hard-nosed(adjective, strong, hard, tough, determined)
6
hardened(adjective, strong, firm, determined, stiff)
6
headstrong(adjective, determined, resolute, uncompromising)
6
opinionated(adjective, determined, resolute, stubborn, uncompromising)
6
unappeasable(adjective, determined, resolute, uncompromising)
5
dogged(adjective, tough, firm, determined, resolute)
5
insistent(adjective, determined, resolute, uncompromising)
5
ossified(adjective, determined, resolute, uncompromising)
5
unshakable(adjective, determined, resolute, uncompromising)
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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>