foolproof

2 definitions • 3 examples

(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 recipe is supposed to be foolproof.

(of a plan, method, or machine) designed to be easily done or operated without possibility of mistake or failure:

It’s not a foolproof system and it never will be.