449 entries under adjective topic. ×

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brutal(mean, hard, tough, severe)
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callous(mean, hard, tough, severe)
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ceaseless(certain, persistent, constant, reliable)
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diligent
4
dour(close, hard, tough, severe)
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enduring(certain, determined, steady, resolute)
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exacting(tough, severe, harsh, cruel)
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fell(animal, mean, harsh, violent)
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flinty(close, strong, hard, tough)
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hard-hearted(mean, hard, tough, evil)
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heartless(mean, severe, evil, nasty)
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hidebound(determined, resolute, obstinate, uncompromising)
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inconvincible(determined, resolute, uncompromising, unshakeable)
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opinionated(determined, resolute, uncompromising, unshakeable)
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ossified(determined, resolute, uncompromising, unshakeable)
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self-opinionated(determined, resolute, uncompromising, unshakeable)
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self-willed(determined, resolute, uncompromising, unshakeable)
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uncompassionate(animal, mean, hard, tough)
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unfailing(certain, unchanging)
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unfeeling(animal, mean, hard, tough)
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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>