Synonyms|1kAntonyms|88|Broader|11Narrower|0Related|196

211 entries under severe topic. ×

8
heartless(adjective, mean, hard, evil)
8
hidebound(adjective, determined, resolute, persistent)
8
unsparing(adjective, mean, strong, hard, tough)
7
dour(adjective, close, hard, sharp)
7
ferocious(adjective, animal, mean, strong)
7
stringent(adjective, set, hard, sharp)
6
unbroken(adjective, violent, pure, vicious)
6
unfeeling(adjective, animal, mean, hard)
6
unsympathetic(adjective, animal, mean, hard)
5
demanding(adjective, difficult, persistent, obstinate)
5
mortal(adjective, mean, harsh, cruel)
5
oppressive(adjective, pure, absolute, severity)
4
cutthroat(adjective, mean, strong, hard)
4
flinty(adjective, close, strong, hard, tough)
4
hard-shell(adjective, strong, hard, tough)
4
unpitying(adjective, mean, harsh, cruel)
3
serious(adjective, close, strong, hard, tough)
3
barbarous(adjective, animal, appearance, mean, strong)
3
cussed(adjective, tough, firm, unreasonable)
3
forbidding(adjective, appearance, strong, hard, tough)
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APASmart Define. (2015). relentless thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/relentless/thesaurus/synonyms
ChicagoSmart Define. 2015. "relentless thesaurus" https://smartdefine.org/relentless/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, relentless thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/relentless/thesaurus/synonyms>.
MLASmart Define. "relentless thesaurus" 24 June 2015. Web. 26 September 2026. <https://smartdefine.org/relentless/thesaurus/synonyms>