2
barbaric(adjective, animal, mean, violent, cruel)
2
beastly(adjective, harsh, violent, vicious, fierce)
2
bestial(adjective, animal, mean, severe, evil)
2
bleak(adjective, appearance, hard, tough, severe)
2
bound(adjective, harsh, cruel, determined, fierce)
2
bull-headed(adjective, determined, resolute, obstinate, uncompromising)
2
careful
2
chronic(adjective, persistent, constant, continuous, endless)
2
cold(adjective, close, mean, strong, hard)
2
consecutive
2
demanding
2
durable
2
emphatic
2
eternal(adjective, certain, persistent, constant, reliable)
2
evergreen(continuity, diuturnity)
2
everlasting(adjective, persistent, constant, continuous, endless)
2
faithful
2
ferocious(adjective, animal, mean, evil, nasty)
2
habitual(adjective, persistent, continuous, endless, relentless)
2
hard-core(adjective, strong, hard, tough, severe)
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APASmart Define. (2015). unrelenting thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/unrelenting/thesaurus/synonyms
ChicagoSmart Define. 2015. "unrelenting thesaurus" https://smartdefine.org/unrelenting/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, unrelenting thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/unrelenting/thesaurus/synonyms>.
MLASmart Define. "unrelenting thesaurus" 3 August 2015. Web. 26 September 2026. <https://smartdefine.org/unrelenting/thesaurus/synonyms>