76 entries under firm topic. ×

1
hard-core(determined, resolute, impulsive, stubborn)
1
hard-nosed(sharp, determined, practical, impulsive)
1
hard as nails(expression, adjective, idiom, tough)
1
hardheaded(adjective, strong, tough, cold)
1
hold the fort(expression, adjective, idiom, tough)
1
hold the line(expression, adjective, idiom, tough)
1
locked in(expression, adjective, tough, difficult)
1
mule(tough, determined, unreasonable, grim)
1
ornery(tough, negative, hostile, stubborn)
1
reserved(adjective, tough, fixed, distant)
1
set in stone(expression, adjective, idiom, tough)
1
standing pat(expression, adjective, tough, distant)
1
unreasonable(tough, grim, inflexible, obstinate)
1
unshakable(adjective, tough, unreasonable, grim)
1
unswayable(adjective, set, tough, distant)
1
uptight(adjective, tough, fixed, distant)
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APASmart Define. (2015). intractable thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/intractable/thesaurus/synonyms
ChicagoSmart Define. 2015. "intractable thesaurus" https://smartdefine.org/intractable/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, intractable thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/intractable/thesaurus/synonyms>.
MLASmart Define. "intractable thesaurus" 24 June 2015. Web. 25 September 2026. <https://smartdefine.org/intractable/thesaurus/synonyms>