- Definitions|1
- Thesaurus|285
- Abbreviations|0
| gold | |
| golden | |
| hard-and-fast(inflexible, intent) | |
| hard-bitten | |
| hard-line | |
| heavy-duty | |
| in the bag(expression, certain, definite, sure, inflexible) | |
| inalterable(inflexible, intent, hard-and-fast) | |
| indurate | |
| intent(inflexible, hard-and-fast) | |
| inveterate(inflexible, intent, hard-and-fast) | |
| irresistible | |
| leaded | |
| leaden | |
| level(inflexible, intent, hard-and-fast) | |
| limited(inflexible, intent, hard-and-fast) | |
| narrow(inflexible, intent, hard-and-fast) | |
| never-failing(inflexible, intent, hard-and-fast) | |
| objective | |
| planned(inflexible, intent, hard-and-fast) |
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| APA | Smart Define. (2015). cast-iron thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/cast-iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "cast-iron thesaurus" https://smartdefine.org/cast-iron/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2015, cast-iron thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/cast-iron/thesaurus/synonyms>. |
| MLA | Smart Define. "cast-iron thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/cast-iron/thesaurus/synonyms> |