Foolproof
Foolproof adjective - Not liable to failure.
Usage example: a foolproof identification system
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Synonyms for Foolproof
Infallible is a synonym for foolproof. In some cases you can use "Infallible" instead an adjective "Foolproof". popular alternative
Infallible
Infallible adjective - Not being or likely to be wrong.
Usage example: a teacher with an infallible memory for names
Foolproof is a synonym for infallible in unfailing topic. You can use "Foolproof" instead an adjective "Infallible", if it concerns topics such as sure, unerring. popular alternative
Nearby Words: infallibly, infallibility
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Cite this Source
Infallible and Foolproof. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/foolproof/infallible
Foolproof & Infallible. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/foolproof/infallible>.
Infallible or Foolproof. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/foolproof/infallible.
Google Ngram Viewer shows how "foolproof" and "infallible" have occurred on timeline