- Definitions|1
- Thesaurus|241
- Abbreviations|0
| inveterate(inflexible, intent) | |
| level(inflexible, intent) | |
| limited(inflexible, intent) | |
| narrow(inflexible, intent) | |
| never-failing(inflexible, intent) | |
| nonflexible | |
| nonindulgent | |
| obdurate(hard, resolute, rigid, inflexible, strict) | |
| pigheaded(obstinate, stubborn, unbending) | |
| planned(inflexible, intent) | |
| prearranged(inflexible, intent) | |
| precise(inflexible, intent) | |
| recalcitrant(obstinate, stubborn, unbending) | |
| relentless(hard, resolute, rigid, inflexible, strict) | |
| resolute(hard, rigid, inflexible, strict, obstinate) | |
| resolute established(expression, inflexible, intent) | |
| resolved(inflexible, intent) | |
| restricted(inflexible, intent) | |
| rigged(inflexible, intent) | |
| rigorous(hard, resolute, rigid, inflexible, strict) |
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| APA | Smart Define. (2015). hard-and-fast thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/hard-and-fast/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "hard-and-fast thesaurus" https://smartdefine.org/hard-and-fast/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, hard-and-fast thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/hard-and-fast/thesaurus/synonyms>. |
| MLA | Smart Define. "hard-and-fast thesaurus" 14 April 2015. Web. 29 September 2026. <https://smartdefine.org/hard-and-fast/thesaurus/synonyms> |