foolproof
adjective
fool·proof
ˈfül-ˌprüf 
: 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
However, it's not ensured to be a foolproof method to verify identity if travelers forget their ID.
—
Mariyam Muhammad, Cincinnati Enquirer, 3 Dec. 2025
Bier warned that the feature is not foolproof, as travel, as well as VPNs, could affect where the accounts say they are based.
—Hadas Gold, CNN Money, 25 Nov. 2025
Here are some foolproof recipes for the classics from cookbook author Robin Miller.
—Endia Fontanez, AZCentral.com, 18 Nov. 2025
Setting up a new user profile is a foolproof way to lock in this initial $20 bonus.
—Tyler Everett, MSNBC Newsweek, 17 Nov. 2025
See All Example Sentences for foolproof
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Mariyam Muhammad, Cincinnati Enquirer, 3 Dec. 2025
Bier warned that the feature is not foolproof, as travel, as well as VPNs, could affect where the accounts say they are based.
—Hadas Gold, CNN Money, 25 Nov. 2025
Here are some foolproof recipes for the classics from cookbook author Robin Miller.
—Endia Fontanez, AZCentral.com, 18 Nov. 2025
Setting up a new user profile is a foolproof way to lock in this initial $20 bonus.
—Tyler Everett, MSNBC Newsweek, 17 Nov. 2025
See All Example Sentences for foolproof
Cite this Entry
“Foolproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foolproof. Accessed 7 Dec. 2025.
Copy CitationKids Definition
foolproof
adjective
fool·proof
ˈfül-ˈprüf
: done, made, or planned so well that nothing can go wrong
foolproof directions
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