754 entries under adjective topic. ×

25
constant(strain, still, fixed, firmness)
25
hard-nosed(mean, strong, hard, tough)
25
resistant(strong, strain, firm, stiff)
25
steady(feature, state, characteristic, complete)
22
adamantine(strong, hard, tough, severe)
22
conservative(strain, firmness, labour, hardiness)
22
durable(strong, strain, firm, stiff)
22
tough(mean, strong, hard, easy)
22
unwavering(determined, resolute, persistent, constant)
21
fast(complete, secure, strain, firm)
21
settled(secure, strain, determined, usual)
20
austere(strong, hard, tough, severe)
20
solid(strong, hard, complete, secure)
20
enduring(strain, firm, fixed, stiff)
20
lasting(strain, firmness, labour, hardiness)
20
permanent(strain, firmness, labour, hardiness)
20
perpetual(strain, firmness, labour, hardiness)
19
exacting(hard, tough, easy, severe)
19
proof(strain, firmness, labour, hardness)
19
quiescent(strain, firmness, labour, hardiness)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 25 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>