189 entries under adjective topic. ×

6
unyielding(strong, hard, tough, firm)
5
uncompromising(severe, firm, harsh, stubborn)
5
rigid(strong, hard, tough, severe)
4
badass(noun, person, hector)
4
faithful(close, correct, firm, honest)
4
inflexible(strong, hard, tough, severe)
4
intransigent
4
obstinate(firm, determined, resolute, impulsive)
4
stern(severe, firm, harsh, serious)
3
hard(strong, tough, severe, firm)
3
hardcore
3
determined(firm, resolute, impulsive, stubborn)
3
devoted(close, correct, firm, honest)
3
die-hard(firm, honest, upright, sure)
3
explicit
3
inveterate
3
resolute(close, correct, firm, honest)
3
staunch(close, correct, firm, honest)
3
steadfast(close, correct, firm, honest)
2
adamant(strong, hard, tough, firm)
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APASmart Define. (2016). hard-core thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/hard-core/thesaurus/synonyms
ChicagoSmart Define. 2016. "hard-core thesaurus" https://smartdefine.org/hard-core/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, hard-core thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/hard-core/thesaurus/synonyms>.
MLASmart Define. "hard-core thesaurus" 28 March 2016. Web. 24 September 2026. <https://smartdefine.org/hard-core/thesaurus/synonyms>