- foolproof, unfailing - not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test"
Antonym: fallible (indirect, via infallible)
- goofproof, goof-proof, foolproof - proof against human misuse, error, etc.; "Foolproof this appliance"
--1 is one way to proof
Sample sentence:
Somebody ----s something