[ id-ee-uh t-proof ]
/ ˈɪd i ətˌpruf /
built, organized, written, etc., in such a way as to be usable by or understandable to any person of average intelligence or skill: an idiot-proof camera.
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Origin of idiot-proof
probably earlier than 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019