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  1. Foolproof definition: involving no risk or harm, even when tampered with.. See examples of FOOLPROOF used in a sentence.

  2. foolproof. (of a plan, machine, method, etc.) very well designed and easy to use so that it cannot fail and you cannot use it wrongly synonym infallible. This recipe is foolproofit works every time. No system can ever be completely foolproof. The system is virtually foolproof.

  3. May 10, 2024 · foolproof. (fuːlpruːf ) adjective. Something such as a plan or a machine that is foolproof is so well designed, easy to understand, or easy to use that it cannot go wrong or be used wrongly. The system is not 100 per cent foolproof. I spent the day working out a foolproof plan to save him.

  4. Foolproof is an early twentieth century American English word that combines fool, or "silly person" and proof, "resistant." Definitions of foolproof. adjective. not liable to failure. “a foolproof identification system”. synonyms: unfailing. infallible. incapable of failure or error. verb.

  5. What does the adjective foolproof mean? There is one meaning in OED's entry for the adjective foolproof . See ‘Meaning & use’ for definition, usage, and quotation evidence.

  6. Define foolproof. foolproof synonyms, foolproof pronunciation, foolproof translation, English dictionary definition of foolproof. adj. 1. Designed so as to be impervious to human incompetence, error, or misuse: a foolproof detonator; a foolproof safety lock. 2. Effective; infallible: a...

  7. Britannica Dictionary definition of FOOLPROOF. [more foolproof; most foolproof] : done, made, or planned so well that nothing can go wrong. foolproof directions. a foolproof plan. DNA fingerprinting gives police a virtually foolproof way to link a suspect to a crime scene.

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