Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb foolproof

1 sense of foolproof

Sense 1
goofproof, goof-proof, foolproof -- (proof against human misuse or error; "foolproof this appliance")
       => proof -- (make resistant (to harm); "proof the materials against shrinking in the dryer")

Antonyms of adj foolproof

1 sense of foolproof

Sense 1
foolproof, unfailing -- (not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test")

INDIRECT (VIA infallible) -> fallible -- (likely to fail or make errors; "everyone is fallible to some degree")

Similarity of adj foolproof

1 sense of foolproof

Sense 1
foolproof, unfailing -- (not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test")
       => infallible (vs. fallible) -- (incapable of failure or error; "an infallible antidote"; "an infallible memory"; "the Catholic Church considers the Pope infallible"; "no doctor is infallible")