- Definitions|2
- Thesaurus|729
- Abbreviations|0
| unchangeable(set, clear, certain, regular, definite) | |
| undeviating(adjective, regular, even, constant, rigid) | |
| unflinching(adjective, set, strong, firm, determined) | |
| uniform(adjective, set, regular, fixed, even) | |
| unlimited(adjective, certain, unchanging) | |
| unrelieved | |
| unstoppable | |
| aeonian | |
| agreeable(adjective, sound, even, flawless, uniform) | |
| all right(honest, sensible, realistic, reliable, mature) | |
| always there(expression, honest, sensible, true, reliable) | |
| assured(certain, unquestionable, undisputable) | |
| authentic(open, honest, sensible, solid, reliable) | |
| authoritative(open, honest, sensible, solid, reliable) | |
| believable(adjective, open, honest, sensible, solid) | |
| bottomless(adjective, certain, unchanging) | |
| boy scout(honest, sensible, realistic, reliable, mature) | |
| calculable | |
| change | |
| come-through(adjective, certain, reliable, trustworthy, unchanging) |
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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> |