foolproof

adjective

fool·​proof ˈfül-ˌprüf How to pronounce foolproof (audio)
: so simple, plain, or reliable as to leave no opportunity for error, misuse, or failure
a foolproof plan

Examples of foolproof in a Sentence

DNA fingerprinting gives police a virtually foolproof way to link a suspect to a crime scene.
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Luxury chocolate is a foolproof gift for all the foodies in your life. Jake Henry Smith, Glamour, 11 Nov. 2025 Anyone wanting to buy a foolproof gift for commerce producer Lauren Arzbaecher should head to Anthropologie. Audrey Lee, Architectural Digest, 3 Nov. 2025 Last but not least, regular cleaning is a foolproof way to prevent the buildup of grease. Brandee Gruener, Southern Living, 3 Nov. 2025 Separating the white and dark meat is always going to be more foolproof than trying to get both to the ideal temperature at the same time. Shilpa Uskokovic, Bon Appetit Magazine, 31 Oct. 2025 See All Example Sentences for foolproof

Word History

First Known Use

1874, in the meaning defined above

Time Traveler
The first known use of foolproof was in 1874

Browse Nearby Words

Cite this Entry

“Foolproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foolproof. Accessed 17 Nov. 2025.

Kids Definition

foolproof

adjective
fool·​proof ˈfül-ˈprüf How to pronounce foolproof (audio)
: done, made, or planned so well that nothing can go wrong
foolproof directions

More from Merriam-Webster on foolproof

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!