423 entries under adjective topic. ×

6
habitual(usual, established)
6
impenitent(hard, tough, harsh, careless)
6
impervious(noun, set, hard, tough)
6
indurated(verb, hard, cool, firm)
6
reinforced(verb, fortified, strengthened)
6
seasoned(set, strong, hard, tough)
6
unrelenting(hard, tough, harsh, determined)
6
unresponsive(person, hard, careless, indifferent)
6
unyielding(set, hard, tough, firm)
5
calloused
5
congealed(verb, set, hard, tough)
5
cool(indifferent, blank, sophisticated, aloof)
5
fortified(verb, strengthened)
5
hard-nosed(hard, determined, resolute, unfeeling)
5
intransigent(determined, fixed, resolute, stubborn)
5
obstinate(determined, fixed, resolute, stubborn)
5
ossified(firm, solid, determined, resolute)
5
remorseless(hard, cold, cruel, pitiless)
5
steeled(noun, verb, set, strong)
5
stonyhearted
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APASmart Define. (2016). hardened thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/hardened/thesaurus/synonyms
ChicagoSmart Define. 2016. "hardened thesaurus" https://smartdefine.org/hardened/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2016, hardened thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/hardened/thesaurus/synonyms>.
MLASmart Define. "hardened thesaurus" 29 March 2016. Web. 26 September 2026. <https://smartdefine.org/hardened/thesaurus/synonyms>