754 entries under adjective topic. ×

6
thorough(complete, severe, harsh, pure)
6
unadaptable(set, hard, stiff, resolute)
6
unbreakable(strong, hard, severe, firm)
6
wooden(hard, correct, firm, solid)
5
Draconian(tough, severe, firm, harsh)
5
Spartan
5
aloof(cool, tough, firm, fair)
5
bovine(determined, resolute, obstinate, uncompromising)
5
brass-bound(determined, resolute, obstinate, uncompromising)
5
bull-headed(determined, resolute, obstinate, uncompromising)
5
dead set(expression, tough, severe, firm)
5
difficult(hard, tough, severe, rough)
5
distant(tough, firm, cold, unfriendly)
5
extreme
5
faithful(correct, solid, intense, exact)
5
finical
5
hardened(strong, hard, tough, firm)
5
icy(cool, severe, cold, detached)
5
immobile(secure, intense, still, steady)
5
ironclad(set, hard, severe, cruel)
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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>