147 entries under determined topic. ×

9
inexorable(adjective, tough, firm, resolute)
9
pigheaded(adjective, tough, firm, difficult, resist)
9
unrelenting(adjective, resolute, obstinate, uncompromising)
9
unswerving(adjective, strong, firm, steady)
8
contrary(adjective, difficult, wild, awkward)
8
hardheaded(adjective, tough, firm, resist)
8
single-minded(adjective, tough, intense, deliberate)
8
unshakable(adjective, strong, tough, firm)
8
vigorous(adjective, strong, sound, tough, fit)
7
bullheaded(adjective, tough, firm, difficult, resist)
7
constant(adjective, strong, tough, flat, firm)
7
decided(adjective, firm, intense, deliberate)
7
enduring(adjective, strong, sound, tough, fit)
7
hard(adjective, strong, fixed, persistent)
7
plucky(adjective, strong, tough, bold)
7
steady(adjective, strong, sound, secure, tough)
7
strong-minded(adjective, firm, fixed, serious)
7
unbendable(adjective, resolute, obstinate, uncompromising)
6
devoted(adjective, strong, firm, steady)
6
hard-nosed(adjective, resolute, obstinate, uncompromising)
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APASmart Define. (2015). tenacious thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/tenacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenacious thesaurus" https://smartdefine.org/tenacious/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, tenacious thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/tenacious/thesaurus/synonyms>.
MLASmart Define. "tenacious thesaurus" 6 November 2015. Web. 24 September 2026. <https://smartdefine.org/tenacious/thesaurus/synonyms>