50 entries under firm topic. ×

8
relentless(adjective, mean, strong, hard, tough)
8
stiff-necked(adjective, mean, strong, hard, tough)
7
adamantine(adjective, strong, hard, tough)
7
persistent(adjective, tough, determined, resolute)
7
unbending(adjective, mean, strong, hard, tough)
6
balky(tough, unreasonable, grim, inflexible)
6
steadfast(adjective, tough, determined, resolute)
5
unshakable(adjective, mean, strong, hard, tough)
4
persevering(adjective, tough, determined, unreasonable)
4
tough(adjective, mean, strong, hard)
3
grim(adjective, strong, hard, tough)
3
single-minded(adjective, tough, determined, resolute)
2
cussed(adjective, tough, unreasonable, grim)
2
incompliant(adjective, tough, difficult, awkward)
2
rebellious(adjective, tough, unreasonable, grim)
2
strong-minded(adjective, determined, fixed, resolute)
1
cantankerous(tough, difficult, awkward, unreasonable)
1
dead set on(expression, adjective, idiom, determined)
1
insubordinate(tough, unreasonable, grim, inflexible)
1
iron(adjective, mean, strong, hard, tough)
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APASmart Define. (2015). mulish thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/mulish/thesaurus/synonyms
ChicagoSmart Define. 2015. "mulish thesaurus" https://smartdefine.org/mulish/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, mulish thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/mulish/thesaurus/synonyms>.
MLASmart Define. "mulish thesaurus" 13 April 2015. Web. 27 September 2026. <https://smartdefine.org/mulish/thesaurus/synonyms>