"foolproof" in the verb sense
1. goofproof, goof-proof, foolproof
proof against human misuse or error
"foolproof this appliance"
"foolproof" in the adjective sense
1. foolproof, unfailing
not liable to failure
"a foolproof identification system"
"the unfailing sign of an amateur"
"an unfailing test"
Source: WordNet® (An amazing lexical database of English)
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