- Definitions|1
- Thesaurus|340
- Abbreviations|0
65 entries under adjective topic. ×
| unfailing | |
| reliable | |
| infallible(dependable, unerring) | |
| sure | |
| dependable | |
| flawless(correct, clean, perfect, pure) | |
| certain(flawless, faultless, textbook, infallible) | |
| sure-fire(dependable, infallible) | |
| fail-safe(fail, thrive, infallible) | |
| faultless(perfect, pure, splendid, flawless) | |
| goofproof(verb, infallible) | |
| guaranteed | |
| safe | |
| perfect(correct, clean, pure, flawless) | |
| unerring(flawless, faultless, textbook, infallible) | |
| easy | |
| accurate(correct, clean, perfect, pure) | |
| secure | |
| simple(flawless, faultless, textbook, handy) | |
| tested |
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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> |