77 entries under firm topic. ×

1
creaky(adjective, hard, solid, stiff)
1
frozen(adjective, hard, solid, stiff)
1
graceless(adjective, hard, solid, stiff)
1
hardened(adjective, hard, tough, solid)
1
immalleable(adjective, hard, solid, stiff)
1
impliable(adjective, hard, solid, stiff)
1
incompliant(adjective, hard, solid, stiff)
1
indurate(adjective, hard, solid, stiff)
1
inelastic(adjective, set, hard, tough)
1
inflexible(adjective, strong, hard, tough)
1
iron(adjective, strong, hard, tough)
1
mechanical(adjective, hard, solid, stiff)
1
numbed(adjective, hard, solid, stiff)
1
ossified(adjective, hard, solid, stiff)
1
petrified(adjective, hard, solid, stiff)
1
refractory(adjective, set, hard, tough)
1
resistant(adjective, hard, solid, stiff)
1
rheumatic(adjective, hard, solid, stiff)
1
rocklike(adjective, strong, hard, substantial)
1
secure(adjective, close, strong, hard)
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APASmart Define. (2016). thick thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/thick/thesaurus/synonyms
ChicagoSmart Define. 2016. "thick thesaurus" https://smartdefine.org/thick/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, thick thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/thick/thesaurus/synonyms>.
MLASmart Define. "thick thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/thick/thesaurus/synonyms>