- Definitions|1
- Thesaurus|760
- Abbreviations|0
| invariable | |
| ironclad | |
| obdurate(adjective, intense, resolute, persistent, rigid) | |
| plodding(adjective, strong, firm, determined, steady) | |
| plugging(adjective, strong, firm, determined, steady) | |
| poised(adjective, firm, solid, stable, fixed) | |
| rocky | |
| secure(adjective, firm, solid, stable, fixed) | |
| settled(adjective, firm, solid, intense, certain) | |
| strong-minded(adjective, firm, certain, serious, resolute) | |
| true-blue(adjective, resolute, persistent, reliable, steadfast) | |
| unafraid(adjective, determined, bold, resolute, unconcerned) | |
| unbending(adjective, firm, certain, limited, definite) | |
| unchangeable(adjective, clear, firm, solid, certain) | |
| undiscouraged(adjective, bold, unconcerned, brave, steadfast) | |
| undrooping | |
| unhesitant | |
| unstoppable | |
| active | |
| agreed(adjective, certain, limited, definite, inflexible) |
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| APA | Smart Define. (2015). unfaltering thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/unfaltering/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unfaltering thesaurus" https://smartdefine.org/unfaltering/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, unfaltering thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/unfaltering/thesaurus/synonyms>. |
| MLA | Smart Define. "unfaltering thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/unfaltering/thesaurus/synonyms> |