- Definitions|1
- Thesaurus|340
- Abbreviations|0
19 entries under infallible topic. ×
| unfailing | |
| reliable | |
| sure | |
| dependable | |
| flawless(adjective, correct, clean, perfect, pure) | |
| certain(adjective, flawless, faultless, textbook) | |
| sure-fire(adjective, dependable) | |
| fail-safe(adjective, fail, thrive) | |
| faultless(adjective, perfect, pure, splendid, flawless) | |
| goofproof(verb, adjective) | |
| guaranteed | |
| safe | |
| perfect(adjective, correct, clean, pure, flawless) | |
| unerring(adjective, flawless, faultless, textbook) | |
| tested | |
| tried | |
| unassailable | |
| idiot-proof | |
| never-failing |
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| APA | Smart Define. (2015). foolproof thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/foolproof/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "foolproof thesaurus" https://smartdefine.org/foolproof/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, foolproof thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/foolproof/thesaurus/synonyms>. |
| MLA | Smart Define. "foolproof thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/foolproof/thesaurus/synonyms> |