idiot-proof - definition and synonyms

adjective informal 

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/ˈɪdiət ˌpruːf/
  1. very easy to use; impossible to use wrongly

    Here are some idiot-proof cake recipes that guarantee an excellent outcome every time.

    Make your order process idiot-proof.

    This meaning is based on one submitted to the Open Dictionary by: Caleb Judy from United States on 05/09/2015