76 entries under determined topic. ×

17
obstinate(adjective, mean, strong, hard, tough)
17
unbendable(adjective, resolute, obstinate, uncompromising)
15
adamant(adjective, mean, strong, hard, secure)
15
unshakeable(adjective, resolute, uncompromising)
12
steady(adjective, clear, strong, secure, solid)
11
hard-nosed(adjective, mean, hard, secure)
11
unfaltering(adjective, clear, firm, solid, certain)
9
set in stone(expression, adjective, idiom, mean, hard)
8
persistent(adjective, strong, tough, firm)
8
tenacious(adjective, strong, tough, firm)
7
dogged(adjective, mean, strong, hard, tough)
7
hanging tough(expression, adjective, mean, hard)
7
pertinacious(adjective, tough, firm, resolute)
7
solid(adjective, strong, hard, secure, tough)
7
stable(adjective, strong, hard, secure, continue)
7
standing pat(adjective, resolute, obstinate, uncompromising)
7
unswayable(adjective, resolute, obstinate, uncompromising)
6
strong(adjective, strong, hard, secure, tough)
5
adamantine(adjective, resolute, uncompromising, unshakeable)
5
mulish(adjective, mean, strong, hard, tough)
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APASmart Define. (2015). unshakable thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unshakable/thesaurus/synonyms
ChicagoSmart Define. 2015. "unshakable thesaurus" https://smartdefine.org/unshakable/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unshakable thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unshakable/thesaurus/synonyms>.
MLASmart Define. "unshakable thesaurus" 10 April 2015. Web. 28 September 2026. <https://smartdefine.org/unshakable/thesaurus/synonyms>