Foolproof
Foolproof adjective - Not liable to failure.
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Synonyms for Foolproof
Sure is a synonym for foolproof in infallible topic. In some cases you can use "Sure" instead an adjective "Foolproof".
Mutual synonyms
Cite this Source
Sure and Foolproof. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/foolproof/sure
Foolproof & Sure. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/foolproof/sure>.
Sure or Foolproof. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/foolproof/sure.
Google Ngram Viewer shows how "foolproof" and "sure" have occurred on timeline