foolproof

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• February 28. 2013 from wordnet.princeton.edu

  foolproof — verb — english

  proof against human misuse or error; "foolproof this appliance"

• March 23. 2016 from wordnet.princeton.edu

  foolproof — adjective — english

  not liable to failure; "a foolproof identification system"; "the unfailing sign of an amateur"; "an unfailing test"