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English definition of “foolproof”

foolproof

adjective uk   /ˈfuːl.pruːf/ us  
(of a plan or machine) so simple and easy to understand that it is unable to go wrong or be used wrongly: I don't believe there's any such thing as a foolproof system for making money. This new DVD player is supposed to be foolproof.Easiness and simplicity
(Definition of foolproof from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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