Synonyms|555Antonyms|160|Broader|1Narrower|0Related|403
2
hard-boiled(adjective, strong, hard, tough, severe)
2
hard-core(adjective, strong, hard, tough, severe)
2
hard-hearted(adjective, cold, cruel, stiff, unfeeling)
2
hard as nails(expression, adjective, idiom, strong, hard)
2
hardhearted(adjective, severe, harsh, cold, unfeeling)
2
headstrong(adjective, resolute)
2
impliable(adjective, hard, firm, solid, stiff)
2
indifferent(adjective, hostile, unfriendly, aloof, distant)
2
indomitable(adjective, set, strong, hard, tough)
2
lead(dull, leaden)
2
livid(dull, leaden)
2
merciless(adjective, cold, cruel, unfeeling, unsympathetic)
2
mousy(dull, leaden)
2
pearly(dull, leaden)
2
persevering(adjective, resolute)
2
pewter
2
powerful
2
resistant(adjective, hard, firm, solid, tense)
2
robust(adjective, strong, hard, tough, sturdy)
2
serious(adjective, strong, hard, tough, severe)
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ChicagoSmart Define. 2015. "steely thesaurus" https://smartdefine.org/steely/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, steely thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/steely/thesaurus/synonyms>.
MLASmart Define. "steely thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/steely/thesaurus/synonyms>