Idiot-proof definition

ĭdē-ət-pro͝of
So easy to use or make that there is very little chance of failure.
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(humorous) Resistant to the mistakes of foolish people.

I tell you, this scheme is idiotproof! It can't go wrong.

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Incapable of being misused even by the most stupid or careless of users.
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Origin of idiot-proof

  • idiot +‎ -proof

    From Wiktionary