- Definitions|1
- Thesaurus|340
- Abbreviations|0
| unfailing(adjective, infallible) | |
| reliable(adjective, infallible) | |
| infallible(adjective, dependable, unerring) | |
| sure(adjective, infallible) | |
| dependable(adjective, infallible) | |
| flawless(adjective, correct, clean, perfect, pure) | |
| certain(adjective, flawless, faultless, textbook, infallible) | |
| sure-fire(adjective, dependable, infallible) | |
| fail-safe(adjective, fail, thrive, infallible) | |
| faultless(adjective, perfect, pure, splendid, flawless) | |
| goofproof(verb, adjective, infallible) | |
| guaranteed(adjective, infallible) | |
| safe(adjective, infallible) | |
| perfect(adjective, correct, clean, pure, flawless) | |
| unerring(adjective, flawless, faultless, textbook, infallible) | |
| easy | |
| accurate(adjective, correct, clean, perfect, pure) | |
| failsafe | |
| goof-proof | |
| positive(flawless, faultless, textbook) |
For more, visit
Foolproof on
Power Thesaurus
| 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> |