- Definitions|1
- Thesaurus|760
- Abbreviations|0
| hardboiled(adjective, serious, resolute, persistent, unwavering) | |
| hell-bent | |
| hubristic | |
| icy(adjective, bold, unconcerned, brave, steadfast) | |
| in the bag(expression, adjective, idiom, certain, limited) | |
| incessant(adjective, strong, firm, determined, steady) | |
| inexcitable | |
| inexorable(adjective, intense, resolute, persistent, rigid) | |
| intense(adjective, firm, solid, deliberate, determined) | |
| invariant | |
| inveterate(adjective, certain, limited, definite, inflexible) | |
| invincible | |
| level(adjective, certain, limited, definite, inflexible) | |
| limited(adjective, certain, definite, inflexible, restricted) | |
| mean business(expression, adjective, intense, deliberate, determined) | |
| meaning business(adjective, steadfast) | |
| mulish(adjective, steadfast) | |
| narrow(adjective, certain, limited, definite, inflexible) | |
| nerveless | |
| never-tiring |
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| APA | Smart Define. (2015). unfaltering thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/unfaltering/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "unfaltering thesaurus" https://smartdefine.org/unfaltering/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, unfaltering thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/unfaltering/thesaurus/synonyms>. |
| MLA | Smart Define. "unfaltering thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/unfaltering/thesaurus/synonyms> |