Synonyms: goof-proof, goofproof, foolproof
Definition: proof against human misuse or error
Usage: foolproof this appliance
Similar words: proof
Definition: make resistant (to harm)
Usage: proof the materials against shrinking in the dryer
Synonyms: unfailing, foolproof
Definition: not liable to failure
Usage: a foolproof identification system; the unfailing sign of an amateur; an unfailing test
Similar words: infallible
Definition: incapable of failure or error
Usage: an infallible antidote; an infallible memory; the Catholic Church considers the Pope infallible; no doctor is infallible