90 entries under strict topic. ×

1
cold-blooded(adjective, mean, tough, evil, nasty)
1
cold fish(expression, adjective, mean, hard, tough)
1
distressing(adjective, tough, harsh, cruel, grim)
1
dyed-in-the-wool(adjective, set, strong, hard, tough)
1
grievous(adjective, tough, harsh, cruel, grim)
1
hard-boiled(adjective, mean, strong, hard, tough)
1
hard as nails(expression, adjective, idiom, tough, firm)
1
hardhearted(adjective, mean, severe, harsh, cruel)
1
hostile(adjective, tough, harsh, cruel, grim)
1
intemperate(adjective, tough, harsh, cruel, grim)
1
intolerable(adjective, tough, harsh, cruel, grim)
1
painful(adjective, tough, evil, nasty, harsh)
1
rancorous(adjective, mean, tough, evil, nasty)
1
resentful(adjective, mean, tough, harsh, cruel)
1
rugged(adjective, strong, hard, tough, severe)
1
serious(adjective, close, strong, hard, tough)
1
sharp(adjective, hard, severe, flat, rough)
1
staunch(hard, firm, certain, determined, resolute)
1
thick-skinned(adjective, mean, hard, tough, harsh)
1
unadaptable(hard, resolute, rigid, inflexible)
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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>