277 entries under adjective topic. ×

2
courageous
2
creaky(hard, firm, solid, stiff)
2
ferrous(strong, hard, tough, sturdy)
2
greyish
2
hard-boiled(strong, hard, tough, severe)
2
hard-core(strong, hard, tough, severe)
2
hard-hearted(cold, cruel, stiff, unfeeling)
2
hard as nails(expression, idiom, strong, hard)
2
hardhearted(severe, harsh, cold, unfeeling)
2
headstrong
2
impliable(hard, firm, solid, stiff)
2
indifferent(hostile, unfriendly, aloof, distant)
2
indomitable(set, strong, hard, tough)
2
merciless(cold, cruel, unfeeling, unsympathetic)
2
persevering
2
resistant(hard, firm, solid, tense)
2
robust(strong, hard, tough, sturdy)
2
serious(strong, hard, tough, severe)
2
stiff as a board(expression, idiom, firm, solid)
2
thorough
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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>