305 entries under adjective topic. ×

1
hard-core(strong, hard, tough, severe)
1
hard-hearted(mean, hard, tough, harsh)
1
hard-line(strong, hard, tough, severe)
1
hard-shell(strong, hard, tough, severe)
1
icy
1
illiberal
1
imperial
1
incessant(persistent, constant, pitiless, unyielding)
1
insubordinate(tough, firm, unreasonable, grim)
1
intense
1
intent(firm, determined, usual, regular)
1
inveterate(firm, determined, usual, regular)
1
iron-fisted(persistent, constant, pitiless, unyielding)
1
iron-willed(determined, resolute, uncompromising, unshakeable)
1
ironclad(firm, determined, usual, regular)
1
keen
1
lean
1
locked in(expression, determined, usual, regular)
1
mean(hard, tough, harsh, unfeeling)
1
merciless(firm, determined, resolute, persistent)
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APASmart Define. (2015). stiff-necked thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/stiff-necked/thesaurus/synonyms
ChicagoSmart Define. 2015. "stiff-necked thesaurus" https://smartdefine.org/stiff-necked/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, stiff-necked thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/stiff-necked/thesaurus/synonyms>.
MLASmart Define. "stiff-necked thesaurus" 13 April 2015. Web. 28 September 2026. <https://smartdefine.org/stiff-necked/thesaurus/synonyms>