American English

Definition of foolproof adjective from the Oxford Advanced American Dictionary



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  1. 1(of a plan, machine, method, etc.) very well designed and easy to use so that it cannot fail and you cannot use it wrongly synonym infallible
  2. 2 This recipe is foolproof—it works every time. No system can ever be completely foolproof.
See the Oxford Advanced Learner's Dictionary entry: foolproof