Synonyms|72Antonyms|1|Broader|0Narrower|0Related|8
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heavy(adjective, strong, hard, tough, sturdy)
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immovable(adjective, strong, hard, tough, sturdy)
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implacable(adjective, strong, hard, tough, sturdy)
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indomitable(adjective, strong, hard, tough, sturdy)
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inexorable(adjective, strong, hard, tough, sturdy)
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inflexible(adjective, strong, hard, tough, sturdy)
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insensible(adjective, strong, hard, tough, sturdy)
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metallic
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mortified(adjective, strong, hard, tough, sturdy)
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mulish(adjective, strong, hard, tough, sturdy)
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obdurate(adjective, strong, hard, tough, sturdy)
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relentless(adjective, strong, hard, tough, sturdy)
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rigid(adjective, strong, hard, tough, sturdy)
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rigorous(adjective, strong, hard, tough, sturdy)
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robust(adjective, strong, hard, tough, sturdy)
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rock hard(expression, adjective, strong, hard, tough)
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rough(adjective, strong, hard, tough, sturdy)
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rugged(adjective, strong, hard, tough, sturdy)
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serious(adjective, strong, hard, tough, sturdy)
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severe(adjective, strong, hard, tough, sturdy)
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APASmart Define. (2013). ferric thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/ferric/thesaurus/synonyms
ChicagoSmart Define. 2013. "ferric thesaurus" https://smartdefine.org/ferric/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2013, ferric thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/ferric/thesaurus/synonyms>.
MLASmart Define. "ferric thesaurus" 17 June 2013. Web. 23 September 2026. <https://smartdefine.org/ferric/thesaurus/synonyms>