Definition of foolproof adjective from the Oxford Advanced American Dictionary

     

    foolproof

     adjective
    adjective
    NAmE//ˈfulpruf//
     
     
    jump to other results
  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