100 entries under severe topic. ×

10
harsh(adjective, mean, strong, hard, tough)
10
resolved(adjective, strong, flat, firm)
10
stiff-necked(adjective, mean, strong, hard, tough)
10
strict(adjective, strong, hard, tough)
8
rigorous(adjective, strong, hard, tough)
7
staunch(adjective, clear, strong, tough)
6
cruel(adjective, strong, hard, tough)
6
flinty(adjective, close, strong, hard, tough)
6
hidebound(adjective, close, firm, determined)
6
persistent(adjective, strong, tough, flat)
6
precise(adjective, correct, certain, limited)
6
tenacious(adjective, clear, strong, tough)
5
austere(adjective, strong, hard, tough)
5
pitiless(adjective, harsh, cruel, determined)
5
puritanical
5
stark(adjective, hard, firm, solid)
5
unfeeling(adjective, hard, tough, harsh)
4
cold(adjective, close, hard, cool)
4
cool(adjective, cold, sensitive, shy)
4
demanding
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APASmart Define. (2016). unbending thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/unbending/thesaurus/synonyms
ChicagoSmart Define. 2016. "unbending thesaurus" https://smartdefine.org/unbending/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, unbending thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/unbending/thesaurus/synonyms>.
MLASmart Define. "unbending thesaurus" 24 March 2016. Web. 27 September 2026. <https://smartdefine.org/unbending/thesaurus/synonyms>