Meaning of idiot-proof

id•i•ot-proof

Pronunciation: (id'ē-ut-prf"), [key]
— adj.
  1. 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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.