Idiot-proof Definition

ĭdē-ət-pro͝of
adjective
So easy to use or make that there is very little chance of failure.
American Heritage
(humorous) Resistant to the mistakes of foolish people.
I tell you, this scheme is idiotproof! It can't go wrong.
Wiktionary

Incapable of being misused even by the most stupid or careless of users.

Wiktionary

Origin of Idiot-proof

  • idiot +‎ -proof

    From Wiktionary

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idiot-proof