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.
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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
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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
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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
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Parchment paper is an essential kitchen tool, helping cooks and bakers prepare flawless dishes while minimizing cleanup.—
Katie Rosenhouse,
Southern Living,
10 Feb. 2026
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Japan's Kaori Sakamoto, who is retiring after this season, had a flawless routine and helped bring her team into a tie.—
Kiki Intarasuwan,
CBS News,
8 Feb. 2026
Adjective
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Only 22 sites would have reliable climate conditions by mid-century, the study found.—
Laura Paddison,
CNN Money,
10 Feb. 2026
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Built for extreme cold Corvus One for Cold Chain uses industrial-grade barcode scanners with precise control over focus and exposure, enabling reliable label capture even when barcodes are frosted, damaged, or low contrast.—
Neetika Walter,
Interesting Engineering,
10 Feb. 2026
Cite this Entry
“Foolproof.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foolproof. Accessed 11 Feb. 2026.
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