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Definition of Foolproof
1. Adjective. Not liable to failure. "An unfailing test"
2. Verb. Proof against human misuse or error. "Foolproof this appliance"
Definition of Foolproof
1. Adjective. For a device: protected, or designed to be proof against misuse or error; fail-safe. ¹
2. Adjective. For an idea or plan: infallible, or bulletproof. ¹
¹ Source: wiktionary.com
Definition of Foolproof
1. [adj]