idiot-proof
US /ˈɪd.i.ət.pruːf/
UK /ˈɪd.i.ət.pruːf/

1.
idiotensicher, narrensicher
designed to be so simple to use that even a very stupid person cannot use it wrongly or damage it
:
•
The new software has an idiot-proof interface.
Die neue Software hat eine idiotensichere Benutzeroberfläche.
•
We need to make sure the instructions are completely idiot-proof.
Wir müssen sicherstellen, dass die Anweisungen absolut idiotensicher sind.