238 entries under severe topic. ×

8
static(adjective, set, secure, still)
7
critical
7
cruel(adjective, strong, hard, tough)
7
dour(adjective, hard, tough, firm)
7
hard-line(adjective, strong, hard, tough)
7
prudish(adjective, tough, correct, firm)
6
changeless(adjective, set, firm, still)
6
cold(adjective, hard, cool, harsh)
6
correct(adjective, hard, rough, difficult)
6
oppressive(adjective, hard, tough, rough)
6
pitiless(adjective, harsh, cruel, determined)
6
proper(adjective, hard, correct, rough)
6
stark(adjective, hard, firm, solid)
6
thorough(adjective, complete, harsh, pure)
6
unbreakable(adjective, strong, hard, firm)
5
Draconian(adjective, tough, firm, harsh)
5
Spartan
5
dead set(expression, adjective, tough, firm)
5
difficult(adjective, hard, tough, rough)
5
icy(adjective, cool, cold, detached)
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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>