← BackshareGuessgoofproof/ˈɡuːf.pruːf/adjectiveDesigned 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.SynonymsfoolproofAntonymsfallible