95 entries under firm topic. ×

1
starchy(adjective, hard, solid, tense)
1
stark(adjective, hard, solid, tense)
1
steely(adjective, hard, solid, tense)
1
stiff as a board(expression, adjective, idiom, solid)
1
taut(adjective, hard, rough, harsh)
1
tense(adjective, hard, solid, stiff)
1
thick(adjective, set, hard, tough)
1
thickened(adjective, hard, solid, tense)
1
unbendable(adjective, tough, unreasonable, grim)
1
unflexible(adjective, hard, solid, tense)
1
ungraceful(adjective, hard, solid, tense)
1
unreasonable(tough, grim, inflexible, obstinate)
1
unsupple(adjective, hard, solid, tense)
1
wooden(adjective, hard, solid, tense)
0
incompressible
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APASmart Define. (2015). refractory thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/refractory/thesaurus/synonyms
ChicagoSmart Define. 2015. "refractory thesaurus" https://smartdefine.org/refractory/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, refractory thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/refractory/thesaurus/synonyms>.
MLASmart Define. "refractory thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/refractory/thesaurus/synonyms>