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
Similar to last season, 3-point shooting remains a concern, but this is the most foolproof roster in the country.
—
Cj Moore
june 2, New York Times, 2 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
This is her foolproof method for getting a bathroom spotless in just 30 minutes.
—Aliyah Rodriguez, The Spruce, 27 May 2026
See All Example Sentences for foolproof
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.
Cj Moore
june 2, New York Times, 2 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
This is her foolproof method for getting a bathroom spotless in just 30 minutes.
—Aliyah Rodriguez, The Spruce, 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 5 Jun. 2026.
Copy CitationKids Definition
foolproof
adjective
fool·proof
ˈfül-ˈprüf
: done, made, or planned so well that nothing can go wrong
foolproof directions
Love words? Need even more definitions?
Merriam-Webster unabridged
