211 entries under severe topic. ×

2
malevolent(adjective, mean, strong, evil)
2
sharp(adjective, hard, nasty, harsh)
2
stark(adjective, bleak, austere, inhospitable)
2
strait-laced(adjective, severity)
2
unalterable(adjective, close, set, hard)
2
vicious(adjective, mean, strong, evil)
1
abrupt
1
acerbic
1
acrimonious
1
acute
1
basic
1
bestial(adjective, animal, mean, evil)
1
bitter(adjective, strong, hard, tough)
1
bloodthirsty(adjective, strong, evil, nasty)
1
blunt
1
brisk
1
brusque
1
caustic
1
censorious
1
coldhearted(adjective, mean, hard, harsh)
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APASmart Define. (2015). relentless thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/relentless/thesaurus/synonyms
ChicagoSmart Define. 2015. "relentless thesaurus" https://smartdefine.org/relentless/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, relentless thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/relentless/thesaurus/synonyms>.
MLASmart Define. "relentless thesaurus" 24 June 2015. Web. 25 September 2026. <https://smartdefine.org/relentless/thesaurus/synonyms>