- Definitions|1
- Thesaurus|241
- Abbreviations|0
| decided(inflexible, intent) | |
| defined(inflexible, intent) | |
| definite(inflexible, intent) | |
| definitive(inflexible, intent) | |
| determined(hard, resolute, rigid, inflexible, strict) | |
| dictated(adjective, strict) | |
| dyed-in-the-wool(hard, resolute, rigid, inflexible, strict) | |
| enduring(inflexible, intent) | |
| firm(hard, rigid, inflexible, strict, obstinate) | |
| flat | |
| hidebound(obstinate, stubborn, unbending) | |
| immovable(hard, rigid, inflexible, strict, obstinate) | |
| implacable(hard, resolute, rigid, inflexible, strict) | |
| in the bag(expression, idiom, inflexible, intent) | |
| indomitable(hard, resolute, rigid, inflexible, strict) | |
| indomitableness | |
| inexorable(hard, resolute, rigid, inflexible, strict) | |
| inexpugnable | |
| intent | |
| intransigent(obstinate, stubborn, unbending) |
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| APA | Smart Define. (2015). hard-and-fast thesaurus. Retrieved September 28, 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 28, 2026). |
| Harvard | Smart Define 2015, hard-and-fast thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/hard-and-fast/thesaurus/synonyms>. |
| MLA | Smart Define. "hard-and-fast thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/hard-and-fast/thesaurus/synonyms> |