170 entries under firm topic. ×

17
mulish(adjective, mean, strong, hard, tough)
17
severe(adjective, appearance, mean, clear, strong)
17
stern(adjective, appearance, mean, hard, easy)
15
steely(adjective, strong, hard, tough)
14
iron(adjective, mean, strong, hard, tough)
14
perverse(adjective, mean, hard, tough)
14
staunch(adjective, clear, strong, sound, tough)
14
unflinching(adjective, mean, strong, severe, flat)
13
bullheaded(adjective, strong, hard, tough)
13
pigheaded(adjective, mean, hard, tough)
13
solid(adjective, set, strong, hard, sound)
12
unswerving(adjective, strong, tough, determined)
11
incompliant(adjective, tough, resist, determined)
11
recalcitrant(adjective, tough, determined, fixed)
11
strict(adjective, strong, hard, tough, easy)
10
hidebound(adjective, determined, stiff, resolute)
10
stony(adjective, mean, hard, harsh)
10
willful(adjective, strong, tough, violent)
9
self-willed(adjective, tough, determined, resolute)
8
persevering(adjective, strong, tough, flat)
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APASmart Define. (2016). unyielding thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/unyielding/thesaurus/synonyms
ChicagoSmart Define. 2016. "unyielding thesaurus" https://smartdefine.org/unyielding/thesaurus/synonyms (accessed September 29, 2026).
HarvardSmart Define 2016, unyielding thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/unyielding/thesaurus/synonyms>.
MLASmart Define. "unyielding thesaurus" 10 March 2016. Web. 29 September 2026. <https://smartdefine.org/unyielding/thesaurus/synonyms>