100 entries under firm topic. ×

6
rigid(adjective, tough, determined, unreasonable)
5
bullheaded(adjective, tough, determined, unreasonable)
5
true(adjective, strong, tough, flat)
5
unbending(adjective, strong, tough, flat)
5
unfailing(adjective, set, strong, energetic)
5
unwearied(adjective, strong, energetic, determined)
4
courageous(adjective, determined, resolute, brave)
4
mulish(adjective, tough, determined, unreasonable)
4
pigheaded(adjective, tough, determined, unreasonable)
4
serious(adjective, strong, determined, resolute)
4
strong-minded(adjective, determined, resolution, serious)
4
tough(adjective, determined, unreasonable, grim)
4
unremitting(adjective, strong, determined, steady)
3
self-willed(adjective, tough, unreasonable, grim)
3
stiff-necked(adjective, tough, unreasonable, grim)
3
unhesitating(adjective, determined, resolution, serious)
2
balky(tough, unreasonable, grim, persistent)
2
bound(adjective, strong, tough, flat)
2
continued(adjective, strong, determined, steady)
2
dead set on(expression, idiom, strong, definite)
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APASmart Define. (2015). persevering thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/persevering/thesaurus/synonyms
ChicagoSmart Define. 2015. "persevering thesaurus" https://smartdefine.org/persevering/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, persevering thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/persevering/thesaurus/synonyms>.
MLASmart Define. "persevering thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/persevering/thesaurus/synonyms>