79 entries under firm topic. ×

46
stiff(adjective, strong, hard, strain)
39
hard(adjective, strong, strain, firmness)
30
unyielding(adjective, strong, strain, firmness)
25
refractory(adjective, strain, solid, firmness)
25
rigid(adjective, strong, strain, stiff)
21
tight(adjective, strong, strain, solid)
9
tough(adjective, strong, hard, fit)
7
immovable(adjective, determined, resolute, obstinate)
7
inflexible(adjective, hard, determined, resolute)
6
resolute(adjective, determined, true, obstinate)
6
solid(adjective, strong, hard, tough, fit)
6
unbendable(adjective, determined, resolute, rigid)
5
fixed(adjective, strong, tough, determined)
5
set(adjective, hard, solid, determined)
5
unbending(adjective, hard, determined, resolute)
4
unwavering(adjective, determined, resolute, obstinate)
3
inelastic(adjective, hard, solid, determined)
2
benumbed(adjective, hard, solid, unfeeling)
2
hardened(adjective, strong, hard, tough, fit)
2
petrified(adjective, hard, solid, tense)
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APASmart Define. (2015). resistant thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/resistant/thesaurus/synonyms
ChicagoSmart Define. 2015. "resistant thesaurus" https://smartdefine.org/resistant/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, resistant thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/resistant/thesaurus/synonyms>.
MLASmart Define. "resistant thesaurus" 19 August 2015. Web. 22 September 2026. <https://smartdefine.org/resistant/thesaurus/synonyms>