151 entries under severe topic. ×

16
unforgiving(adjective, mean, hard, tough)
15
unappeasable(adjective, mean, harsh, cruel)
14
ruthless(adjective, animal, appearance, mean, hard)
13
merciless(adjective, appearance, mean, hard, tough)
11
pitiless(adjective, animal, mean, hard, tough)
11
tough(adjective, mean, strong, hard)
10
unmerciful(adjective, mean, hard, tough)
7
austere(adjective, appearance, strong, hard, tough)
7
rough(adjective, strong, hard, tough)
6
mortal(adjective, mean, harsh, cruel)
6
rigorous(adjective, strong, hard, tough)
6
strict(adjective, strong, hard, tough)
6
unflinching(adjective, mean, harsh, cruel)
6
unsympathetic(adjective, animal, mean, hard, tough)
4
barbarous(adjective, animal, appearance, mean, hard)
4
bitter(adjective, strong, hard, tough)
4
brutal(adjective, mean, hard, tough)
4
callous(adjective, mean, hard, tough)
4
dour(adjective, close, hard, tough)
4
exacting(adjective, tough, harsh, cruel)
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APASmart Define. (2015). unrelenting thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unrelenting/thesaurus/synonyms
ChicagoSmart Define. 2015. "unrelenting thesaurus" https://smartdefine.org/unrelenting/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, unrelenting thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unrelenting/thesaurus/synonyms>.
MLASmart Define. "unrelenting thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/unrelenting/thesaurus/synonyms>