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
There are no foolproof safety guarantees, but parents should prioritize investing time in some sort of hands-on driving course.
—
Doug Turnbull, AJC.com, 7 June 2026
This strategy, of course, would not be foolproof.
—Max Bultman, New York Times, 5 June 2026
This melanin is not foolproof in protecting your skin, though.
—Bruce Y. Lee, Forbes.com, 31 May 2026
Having a beloved couple (Jim and Pam, Cory and Topanga) exchange vows was once a foolproof way to juice TV ratings.
—Judy Berman, Time, 27 May 2026
See All Example Sentences for foolproof
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Doug Turnbull, AJC.com, 7 June 2026
This strategy, of course, would not be foolproof.
—Max Bultman, New York Times, 5 June 2026
This melanin is not foolproof in protecting your skin, though.
—Bruce Y. Lee, Forbes.com, 31 May 2026
Having a beloved couple (Jim and Pam, Cory and Topanga) exchange vows was once a foolproof way to juice TV ratings.
—Judy Berman, Time, 27 May 2026
See All Example Sentences for foolproof
Cite this Entry
“Foolproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foolproof. Accessed 16 Jun. 2026.
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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