58 entries under solid topic. ×

44
firm(adjective, strong, tough, strain, fit)
25
refractory(adjective, strain, firm, firmness)
21
tight(adjective, strong, strain, firm)
9
tough(adjective, strong, hard, fit, firm)
5
set(adjective, hard, firm, determined)
4
unbreakable(adjective, strong, hard, tough)
3
inelastic(adjective, hard, firm, determined)
2
benumbed(adjective, hard, firm, unfeeling)
2
cohesive(adjective, strong, hard, stiff)
2
dense(adjective, strong, hard, stiff)
2
fibrous(adjective, strong, hard, stiff)
2
flinty(adjective, strong, hard, stiff)
2
hardened(adjective, strong, hard, tough, fit)
2
leathery(adjective, strong, hard, stiff)
2
petrified(adjective, hard, firm, tense)
2
steely(adjective, hard, firm, tense)
2
stony(adjective, hard, firm, stiff)
1
annealed(adjective, hard, firm, tense)
1
arthritic(adjective, hard, firm, tense)
1
brawny(adjective, strong, hard, sound, tough)
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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>