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
To round out the dish, add rotisserie chicken, peas, and herbs for a foolproof one-pot meal that tastes like you’re dining in a restaurant.
—
Marianne Williams, Southern Living, 21 Feb. 2026
Protective barriers like rug pads can help with distributing the weight from a heavy piece of furniture, but these aren't foolproof, Cox says.
—Caroline Lubinsky, Martha Stewart, 19 Feb. 2026
Of course, the tests are not foolproof.
—Tanya Lewis, Scientific American, 19 Feb. 2026
The system isn’t exactly foolproof.
—Eliza Shapiro, New York Times, 14 Feb. 2026
See All Example Sentences for foolproof
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Marianne Williams, Southern Living, 21 Feb. 2026
Protective barriers like rug pads can help with distributing the weight from a heavy piece of furniture, but these aren't foolproof, Cox says.
—Caroline Lubinsky, Martha Stewart, 19 Feb. 2026
Of course, the tests are not foolproof.
—Tanya Lewis, Scientific American, 19 Feb. 2026
The system isn’t exactly foolproof.
—Eliza Shapiro, New York Times, 14 Feb. 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 22 Feb. 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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