goofproof

/ˈɡuːf.pruːf/
adjective
  1. Designed to be impossible to use incorrectly or to fail, even by a careless person.
    • They created a goofproof lock that never jams.
    • The instructions are goofproof, so you can't make a mistake.
    • This goofproof camera is perfect for beginners.
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What does "goofproof" mean? | whatsthatwordmean | whatsthatwordmean