fool ‧ proof /ˈfuːlpruːf/ BrE AmE adjective
a foolproof method, plan, system etc is certain to be successful SYN infallible :
a foolproof way of preventing credit card fraud
fool ‧ proof /ˈfuːlpruːf/ BrE AmE adjective
a foolproof method, plan, system etc is certain to be successful SYN infallible :
a foolproof way of preventing credit card fraud
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012