449 entries under adjective topic. ×

8
perpetual(determined, steady, persistent, constant)
8
savage(animal, mean, hard, tough)
8
unswayable(determined, resolute, rigid, obstinate)
7
austere(appearance, strong, hard, tough)
7
brassbound(resist, determined, resolute, persistent)
7
die-hard(resist, determined, resolute, persistent)
7
hanging tough(expression, mean, hard, determined)
7
headstrong(strong, tough, firm, cold)
7
incessant(firm, determined, steady, persistent)
7
inhuman(animal, mean, hard, tough)
7
lasting(certain, persistent, constant, reliable)
7
persevering
7
pigheaded(mean, hard, tough, firm)
7
rough(strong, hard, tough, severe)
7
standing pat(determined, resolute, obstinate, uncompromising)
7
unflagging(persistent, perseverance)
7
unshakeable(determined, resolute, uncompromising)
7
unswerving(determined, resolute, perseverance, uncompromising)
6
hardened(hard, tough, harsh, determined)
6
intractable(appearance, strong, tough, firm)
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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>