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
Not a foolproof buy signal, though the past two times this occurred preceded a decent further up leg.
—
Michael Santoli, CNBC, 9 Sep. 2025
Lego sets are a foolproof way to keep everyone entertained, and Target recently dropped so many new kits.
—Rachel Trujillo, PEOPLE, 8 Sep. 2025
Ultrasounds, though highly accurate, are not foolproof.
—Daniella Gray, MSNBC Newsweek, 1 Sep. 2025
But, there are some foolproof ways to choose a sensory-friendly paint color.
—Shivani Vyas, Better Homes & Gardens, 27 Aug. 2025
See All Example Sentences for foolproof
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Michael Santoli, CNBC, 9 Sep. 2025
Lego sets are a foolproof way to keep everyone entertained, and Target recently dropped so many new kits.
—Rachel Trujillo, PEOPLE, 8 Sep. 2025
Ultrasounds, though highly accurate, are not foolproof.
—Daniella Gray, MSNBC Newsweek, 1 Sep. 2025
But, there are some foolproof ways to choose a sensory-friendly paint color.
—Shivani Vyas, Better Homes & Gardens, 27 Aug. 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 18 Sep. 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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