- Definitions|1
- Thesaurus|340
- Abbreviations|0
| secure | |
| simple(adjective, flawless, faultless, textbook, handy) | |
| tested(adjective, infallible) | |
| tried(adjective, infallible) | |
| trustworthy | |
| unassailable(adjective, infallible) | |
| warranted | |
| watertight | |
| absolute(pure, flawless, faultless, textbook, superlative) | |
| accomplished(pure, splendid, flawless, faultless, textbook) | |
| adaptable | |
| adept(pure, splendid, flawless, faultless, textbook) | |
| airtight | |
| ballproof | |
| beyond compare(expression, pure, splendid, flawless, faultless) | |
| blameless(correct, perfect, pure, splendid, flawless) | |
| bombproof | |
| bulletproof | |
| burglarproof | |
| classical(pure, flawless, faultless, textbook, superlative) |
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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> |