- Definitions|1
- Thesaurus|241
- Abbreviations|0
| set-up(inflexible, intent) | |
| set in concrete(adjective, strict) | |
| set in your ways(expression, idiom, obstinate, stubborn, unbending) | |
| stated(inflexible, intent) | |
| stern | |
| stiff(adjective, set, hard, resolute, rigid) | |
| stipulated(inflexible, intent) | |
| stringently enforced | |
| sure(inflexible, intent) | |
| unblinking(inflexible, intent) | |
| undeviating(inflexible, intent) | |
| unfaltering(inflexible, intent) | |
| unflinching(inflexible, intent) | |
| unmodifiable(inflexible, intent) | |
| unmovable(inflexible, intent) | |
| unqualified(inflexible, intent) | |
| unrelenting(hard, resolute, rigid, inflexible, strict) | |
| unwavering(inflexible, intent) | |
| unyielding(hard, rigid, inflexible, strict, obstinate) |
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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> |