118 entries under hard topic. ×

3
harsh(adjective, strong, tough, severe)
3
immutable(adjective, set, stiff, rigid)
3
intractable(adjective, set, stiff, rigid)
3
rough(adjective, strong, tough, severe)
3
stiff-necked(adjective, strong, tough, determined)
3
strict(adjective, set, strong, tough)
3
unalterable(adjective, set, stiff, inflexible)
2
arthritic(adjective, firm, solid, stiff)
2
buckram(adjective, firm, solid, stiff)
2
bullheaded(adjective, strong, tough, severe)
2
creaky(adjective, firm, solid, stiff)
2
ferrous(adjective, strong, tough, sturdy)
2
hard-boiled(adjective, strong, tough, severe)
2
hard-core(adjective, strong, tough, severe)
2
hard as nails(expression, adjective, idiom, strong)
2
impliable(adjective, firm, solid, stiff)
2
indomitable(adjective, set, strong, tough)
2
resistant(adjective, firm, solid, tense)
2
robust(adjective, strong, tough, sturdy)
2
serious(adjective, strong, tough, severe)
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APASmart Define. (2015). steely thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/steely/thesaurus/synonyms
ChicagoSmart Define. 2015. "steely thesaurus" https://smartdefine.org/steely/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, steely thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/steely/thesaurus/synonyms>.
MLASmart Define. "steely thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/steely/thesaurus/synonyms>