- Definitions|2
- Thesaurus|729
- Abbreviations|0
196 entries under adjective topic. ×
| reliable(honest, solid, certain, true) | |
| infallible(certain, sure, flawless, reliable) | |
| loyal(good, strong, honest, solid) | |
| constant(good, change, strong, continue) | |
| sure(certain, true, definite, reliable) | |
| certain(strong, certain, true, sure) | |
| unflagging(strong, continue, firm, certain) | |
| dependable(good, strong, honest, solid) | |
| persistent(strong, continue, firm, certain) | |
| trustworthy(good, strong, honest, solid) | |
| foolproof | |
| staunch(noun, good, strong, firm) | |
| steadfast(good, strong, honest, solid) | |
| unfaltering(set, clear, strong, firm) | |
| indefatigable(set, strong, continue, firm) | |
| invariable(change, certain, regular, fixed) | |
| steady(good, strong, firm, honest) | |
| tireless(set, strong, continue, firm) | |
| trusty(good, strong, honest, solid) | |
| untiring(continue, determined, tired, persevering) |
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| APA | Smart Define. (2016). unfailing thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/unfailing/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "unfailing thesaurus" https://smartdefine.org/unfailing/thesaurus/synonyms (accessed September 28, 2026). |
| Harvard | Smart Define 2016, unfailing thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/unfailing/thesaurus/synonyms>. |
| MLA | Smart Define. "unfailing thesaurus" 3 March 2016. Web. 28 September 2026. <https://smartdefine.org/unfailing/thesaurus/synonyms> |