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
The Antiaging Routine The first step to a summer glow-up is a foolproof skin care routine.
—
Alanna Martine Kilkeary, Glamour, 27 Apr. 2026
Even so, experts caution that these medications are not foolproof — and using them the wrong way can undermine results or even create new health problems.
—Melissa Rudy, FOXNews.com, 26 Apr. 2026
In a warming world, trees are one of the most foolproof defenses — taking greenhouse gases out of the atmosphere and providing shade that can lower air conditioning bills.
—Orlando Sentinel Editorial Board, The Orlando Sentinel, 25 Apr. 2026
The plan doesn’t seem so foolproof to me anyway.
—R. Eric Thomas, Chicago Tribune, 15 Apr. 2026
See All Example Sentences for foolproof
Alanna Martine Kilkeary, Glamour, 27 Apr. 2026
Even so, experts caution that these medications are not foolproof — and using them the wrong way can undermine results or even create new health problems.
—Melissa Rudy, FOXNews.com, 26 Apr. 2026
In a warming world, trees are one of the most foolproof defenses — taking greenhouse gases out of the atmosphere and providing shade that can lower air conditioning bills.
—Orlando Sentinel Editorial Board, The Orlando Sentinel, 25 Apr. 2026
The plan doesn’t seem so foolproof to me anyway.
—R. Eric Thomas, Chicago Tribune, 15 Apr. 2026
See All Example Sentences for foolproof
Recent Examples of Synonyms for foolproof
Adjective
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Premium Back Massager Practical, sleek, and top of the line, this back massager is perfect for at-home spa days.—
Maeve Dunigan,
New Yorker,
7 May 2026
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The conditions were perfect for airlines to raise fares – bad news for bargain-seeking travelers.—
Chris Isidore,
CNN Money,
6 May 2026
Adjective
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Mushrooms muscle in for beef in a potent faux Bolognese; the hefty hempseed burger, crispy without and juicy within, is too tall to fit your mouth; and every piece of lettuce is flawless.—
Ligaya Mishan,
New York Times,
11 May 2026
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Shanto played an almost flawless innings and raised his sixth test half-century off 90 balls with a single to mid-off off Afridi.—
ABC News,
ABC News,
11 May 2026
Adjective
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Even recognizing one or two reliable triggers—like tight clothing, prolonged sitting or hot weather—can help guide meaningful adjustments.—
Lauryn Higgins,
Flow Space,
11 May 2026
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The dogs provide rangers with a reliable way to etch trails, haul supplies and even assist park scientists with snow-dependent research.—
K. R. Callaway,
Scientific American,
11 May 2026
Cite this Entry
“Foolproof.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foolproof. Accessed 13 May. 2026.
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