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
An InStyle writer, 29, and her mom, 61, still reach for it for foolproof coverage that doesn’t budge.
—
Reece Andavolgyi, InStyle, 22 Jan. 2026
Forecasting is never foolproof, but since the pandemic, professional forecasters have been mostly on target, if a little pessimistic.
—The Editorial Board, Chicago Tribune, 12 Jan. 2026
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
See All Example Sentences for foolproof
Reece Andavolgyi, InStyle, 22 Jan. 2026
Forecasting is never foolproof, but since the pandemic, professional forecasters have been mostly on target, if a little pessimistic.
—The Editorial Board, Chicago Tribune, 12 Jan. 2026
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
See All Example Sentences for foolproof
Recent Examples of Synonyms for foolproof
Adjective
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Niseko Village is also home to an international ski school, a handful of brilliant restaurants, an outdoor activity park that’s perfect for summer, and two golf courses.—
Condé Nast,
Condé Nast Traveler,
26 Feb. 2026
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Cooper's game-winning catch at Penn State is a perfect example of that.—
Joe Nguyen,
Denver Post,
26 Feb. 2026
Adjective
-
Upgrade to brushes that deliver a flawless, streak-free makeup application.—
Tory Johnson,
ABC News,
24 Feb. 2026
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For most of the night, the Jayhawks were flawless in forcing Houston’s guards into hard shots and keeping star freshman Kingston Flemings from getting into the paint or hitting his patented pull-up jumper.—
CJ Moore,
New York Times,
24 Feb. 2026
Adjective
-
Yet there are realities of life without constant and reliable electricity beyond evenings by candlelight.—
Sophia Panych,
Allure,
24 Feb. 2026
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The second focuses on inclusion with companies committing to strengthening testing and evaluation of AI systems across underrepresented languages and cultural contexts, especially in the Global South, so that frontier AI models become more reliable and accessible beyond English‑speaking markets.—
Beatrice Nolan,
Fortune,
23 Feb. 2026
Cite this Entry
“Foolproof.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foolproof. Accessed 2 Mar. 2026.
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