134 entries under firm topic. ×

2
unwearied(adjective, strong, determined, steady)
2
valiant(adjective, strong, tough, vigorous)
1
able(adjective, strong, sound, tough, fit)
1
attached(secure, true, fixed, constant)
1
capable(adjective, strong, sound, tough, fit)
1
close(true, fixed, constant, steadfast)
1
continued(adjective, strong, determined, steady)
1
driven(adjective, determined, serious, resolute)
1
eager beaver(expression, adjective, strong, determined)
1
fastened(adjective, strong, secure, solid)
1
fireball(adjective, strong, determined, steady)
1
fortified(adjective, strong, solid, true)
1
go-go(adjective, strong, determined, steady)
1
grind(adjective, strong, determined, steady)
1
incessant(adjective, strong, determined, steady)
1
inexhaustible(adjective, strong, determined, steady)
1
mighty(adjective, strong, hard, sound, tough)
1
muscular(adjective, strong, sound, tough, fit)
1
ornery(tough, unreasonable, grim, inflexible)
1
remorseless(adjective, tough, unreasonable, grim)
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APASmart Define. (2015). tenacious thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/tenacious/thesaurus/synonyms
ChicagoSmart Define. 2015. "tenacious thesaurus" https://smartdefine.org/tenacious/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, tenacious thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/tenacious/thesaurus/synonyms>.
MLASmart Define. "tenacious thesaurus" 6 November 2015. Web. 25 September 2026. <https://smartdefine.org/tenacious/thesaurus/synonyms>