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In some senses, idiot-proof is marked as informal, humorous. Watch for register when choosing this word.
idiot-proof
adj 1verb 1
Collocations
1ADJ.
safe
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ADJ.
safe
adj
Incapable of being misused even by the most stupid or careless of users.
I tell you, this scheme is idiot-proof! It can't go wrong.
verb
To render something idiot-proof.
I tell you, this scheme is idiot-proof! It can't go wrong.
WiktionaryThis safe is idiot-proof.
Tatoeba · #9305910i Register
In some senses, idiot-proof is marked as informal, humorous. Watch for register when choosing this word.