Foolproof
-
[Something] that [a fool] cant [mess with]
Foolproof meaning & definition 1 of Foolproof.
-
Incapable of going wrong or being misused.
Foolproof meaning & definition 2 of Foolproof.
-
(of a plan or machine) so simple and easy to understand that it is unable to go wrong or be used wrongly:
Foolproof meaning & definition 3 of Foolproof.