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
Your favorite game day dip just became foolproof.
—
Jenna Sims, Southern Living, 25 Dec. 2025
Olaplex The Full-On Shine Hair Routine Gift Set Soft, glossy hair never goes out of style, which makes Olaplex’s Full-On Shine Hair Routine Gift Set a foolproof pick.
—Jennifer Hussein, Allure, 18 Dec. 2025
While the Registry is not entirely foolproof, cellphone owners may decide that any decrease in unsolicited phone calls is worth signing up.
—Jeremy Tanner, The Hill, 12 Dec. 2025
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
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.
Jenna Sims, Southern Living, 25 Dec. 2025
Olaplex The Full-On Shine Hair Routine Gift Set Soft, glossy hair never goes out of style, which makes Olaplex’s Full-On Shine Hair Routine Gift Set a foolproof pick.
—Jennifer Hussein, Allure, 18 Dec. 2025
While the Registry is not entirely foolproof, cellphone owners may decide that any decrease in unsolicited phone calls is worth signing up.
—Jeremy Tanner, The Hill, 12 Dec. 2025
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
See All Example Sentences for foolproof
Cite this Entry
“Foolproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/foolproof. Accessed 27 Dec. 2025.
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
Share