(comparative more failproof, superlative most failproof)
fail + -proof
"failproof." YourDictionary, n.d. Web. 05 December 2018. <https://www.yourdictionary.com/failproof>.
failproof. (n.d.). Retrieved December 05th, 2018, from https://www.yourdictionary.com/failproof
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