So easy to use or make that there is very little chance of failure: “idiot-proof recipes that cut corners by making use of packaged foods” (Howie Rumberg).
(comparative more idiotproof, superlative most idiotproof)
- (humorous) Resistant to the mistakes of foolish people.
- I tell you, this scheme is idiotproof! It can't go wrong.
idiot + -proof