- Definitions|2
- Thesaurus|1.2k
- Abbreviations|0
| unequivocal(clear, certain, valid, unquestionable, undisputable) | |
| unfaultable | |
| unimpeachable(adjective, perfect, precise, flawless, faultless) | |
| unmixed | |
| unspotted | |
| untainted | |
| valid(clear, complete, certain, sure, unquestionable) | |
| abiding(certain, reliable, trustworthy, unquestionable, undisputable) | |
| admittedly | |
| alright | |
| an | |
| assault | |
| assiduous | |
| assurance | |
| assuredly | |
| attack | |
| bottomless | |
| bound to be(expression, idiom, certain, unquestionable, undisputable) | |
| boundless | |
| break |
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| APA | Smart Define. (2015). infallible thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/infallible/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "infallible thesaurus" https://smartdefine.org/infallible/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, infallible thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/infallible/thesaurus/synonyms>. |
| MLA | Smart Define. "infallible thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/infallible/thesaurus/synonyms> |