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
Origin of Idiot-proof
-
idiot + -proof
From Wiktionary
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