as in perfect
done, made, or planned so well that nothing can go wrong
a foolproof plan DNA fingerprinting gives police a virtually foolproof way to link a suspect to a crime scene.
Related Words
Relevance
Dissimilar Words
Example Sentences
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.
Recent Examples of foolproof
Natural Materials Introducing natural elements that bring the outdoors inside are a foolproof way to make your interior feel calming.
—
Kristin Hohenadel, The Spruce, 5 Jan. 2026
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
Kristin Hohenadel, The Spruce, 5 Jan. 2026
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
Recent Examples of Synonyms for foolproof
Adjective
-
Host a Pottery or Clay Night Air-dry or oven-bake clay is beginner-friendly and perfect for a cozy craft night.—
Lauren Schuster,
Miami Herald,
4 Feb. 2026
-
Consider giving the décor a slight nautical touch, and define the dining area with charming string lights to give your evening a perfect glow as the sun sets.—
Shelby Wax,
Vogue,
4 Feb. 2026
Adjective
-
Sabalenka’s semifinal was nearly flawless except for one loose service game early in the second set that handed Svitolina a brief break.—
The Athletic Staff,
New York Times,
31 Jan. 2026
-
The stock reflects a flawless execution scenario, with limited leeway for mistakes in light of challenges from China and modest short-term growth.—
Trefis Team,
Forbes.com,
30 Jan. 2026
Adjective
-
This makes vocal communication a reliable way — if not the only way — for dolphins to maintain contact with one another, especially when traveling, hunting or navigating social situations.—
Scott Travers,
Forbes.com,
27 Jan. 2026
-
When economic conditions feel unstable, gold is often viewed as a safe and reliable investment.—
Brady Halbleib,
CBS News,
27 Jan. 2026
Cite this Entry
“Foolproof.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foolproof. Accessed 8 Feb. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
