Synonyms|251Antonyms|39|Broader|2Narrower|0Related|383

50 entries under rigid topic. ×

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concentrated(adjective, set, strong, hard, firm)
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consolidated(adjective, set, strong, hard, firm)
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ferric(adjective, strong, hard, tough, sturdy)
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ferrous(adjective, strong, hard, tough, sturdy)
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hard-and-fast(hard, resolute, inflexible, strict)
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indurated(adjective, set, strong, hard, firm)
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packed(adjective, set, strong, hard, firm)
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steel(adjective, strong, hard, tough, sturdy)
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tough inflexible(expression, strong, hard, tough, sturdy)
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unswayable(hard, resolute, inflexible, strict)
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ChicagoSmart Define. 2015. "adamantine thesaurus" https://smartdefine.org/adamantine/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, adamantine thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/adamantine/thesaurus/synonyms>.
MLASmart Define. "adamantine thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/adamantine/thesaurus/synonyms>