foolproof

1. Of a device: protected against, or designed to be proof against, misuse or error.

   narrensicher, idiotensicher

2. Of an idea or plan: certain to succeed in all eventualities, or claimed to be so; infallible.

1. Our plan is foolproof.

   deUnser Plan ist idiotensicher.

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2. The system is hardly foolproof.

   deDas System ist nicht besonders narrensicher.

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3. Our plan was totally foolproof.

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4. Nothing is foolproof to a talented fool.

   deNichts ist narrensicher für einen talentierten Narren.

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5. They designed their plan to be foolproof.

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