adjective
A word or phrase that describes or modifies a noun or pronoun, such as 'idiot-proof' in this case.
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The new software program was designed to be idiot-proof for users of all skill levels.
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Don't worry, this device is completely idiot-proof so you can't mess it up.
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This app is so idiot-proof, even your grandma could use it.
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The step-by-step instructions were idiot-proof, making it easy for anyone to follow.