183 entries under firm topic. ×

6
buckram(adjective, hard, solid, stiff)
6
changeless(adjective, set, severe, still)
6
dense(adjective, set, strong, hard, tough)
6
frozen(adjective, hard, solid, fixed)
6
headstrong(adjective, tough, unreasonable, inflexible)
6
indurate(adjective, mean, hard, determined)
6
oppressive(adjective, hard, tough, severe, rough)
6
persevering(adjective, tough, determined, unreasonable)
6
stark(adjective, hard, severe, solid)
6
unbreakable(adjective, strong, hard, severe)
6
wooden(adjective, hard, correct, solid)
5
Draconian(adjective, tough, severe, harsh)
5
aloof(adjective, cool, tough, fair)
5
dead set(expression, adjective, tough, severe)
5
distant(adjective, tough, cold, unfriendly)
5
hardened(adjective, strong, hard, tough)
5
starchy(adjective, hard, solid, stiff)
5
sturdy(adjective, close, set, strong, hard)
4
authoritarian(adjective, strong, hard, tough, severe)
4
compact(adjective, close, set, strong, hard)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 26 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>