120 entries under harsh topic. ×

9
stuffy(adjective, tough, correct, moderate, severe)
9
undeviating(adjective, severe, cruel, determined)
8
single-minded(adjective, tough, severe, firm)
7
callous(adjective, set, mean, strong, hard)
7
cruel(adjective, strong, hard, tough, severe)
7
dour(adjective, hard, tough, severe, firm)
7
prudish(adjective, tough, correct, severe, firm)
6
cold(adjective, hard, cool, severe)
6
finicky(adjective, tough, strict, thorough)
6
fussy(adjective, tough, strict, particular)
6
oppressive(adjective, hard, tough, severe, rough)
6
pitiless(adjective, severe, cruel, determined)
6
thorough(adjective, complete, severe, pure)
5
Draconian(adjective, tough, severe, firm)
5
dead set(expression, adjective, tough, severe, firm)
5
difficult(adjective, hard, tough, severe, rough)
5
sharp(adjective, hard, correct, severe, rough)
5
unfeeling(adjective, mean, hard, cool, severe)
5
unsympathetic(adjective, mean, hard, severe)
4
astringent(adjective, strong, hard, tough, severe)
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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>