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 Electric or Manual Electric openers are often foolproof tools but need to be charged in order to function and are often bigger and bulkier than manual openers. Maya Polton, Better Homes & Gardens, 8 Feb. 2024 However, these aren’t completely foolproof solutions. Korin Miller, Health, 1 Feb. 2024 Whip up a batch of these, along with a bowl full of one of our favorite holiday punches, for a foolproof party lineup. Julia Reed, Southern Living, 31 Dec. 2023 Obviously, the suggestions above aren’t foolproof strategies to fill your void, especially if loneliness has been a persistent issue. Jenna Ryu, SELF, 15 Dec. 2023 Decorating the outside of your home by hanging wreaths on the windows is a foolproof way to add holiday curb appeal to the neighborhood. Jenna Sims, Southern Living, 28 Nov. 2023 Proenza Schouler faux-fur coat A faux fur is a foolproof way to stay warm. Porter Simmons, Vogue, 24 Nov. 2023 Experts and strategists have also stressed that off-year contests are not foolproof predictors of presidential elections, which usually see much larger voter turnout amid national dynamics that can be different from the quirks and preferences of local races. Tal Axelrod, ABC News, 10 Nov. 2023 Her look was completed with an olive green Loewe statement bag and classic black pumps, which would make for a foolproof office outfit. Jennifer Chan, Peoplemag, 4 Sep. 2023 See More

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'foolproof.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History

First Known Use

1874, in the meaning defined above

Time Traveler
The first known use of foolproof was in 1874

Dictionary Entries Near foolproof

Cite this Entry

“Foolproof.” Dictionary, Merriam-Webster, Accessed 21 Feb. 2024.

Kids Definition


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!