FOOLPROOF Synonyms: 20 Similar and Opposite Words

foolproof

adjective

Definition of foolproof

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 Read on for five foolproof ideas for what shoes to wear with satin pants, all inspired by street-style looks and ready to upgrade your early-fall rotation. — India Roby, Glamour, 16 July 2026 Cooking fruits and vegetables is the only foolproof way to kill the parasite, de Latour said. — Melina Khan, USA Today, 16 July 2026 Fortunately, Jennifer Garner lent us a foolproof formula while on a recent trip with her family in Virginia. — Better Homes & Gardens, 16 July 2026 Soon enough, Karl’s seemingly foolproof blackmail scheme devolves into a merciless, dog-eat-dog fight for survival, and the two men are locked in a cutthroat collision course, their fates now inextricably linked. — Ryan Lattanzio, IndieWire, 15 July 2026 See All Example Sentences for foolproof

Recent Examples of Synonyms for foolproof

Adjective

This patch of land to the west of San Sebastián feels like the most perfect place on the planet, while still being a 10-minute car ride from the center of the city.

— Condé Nast, Condé Nast Traveler, 4 Aug. 2026
Incorporating them into your wardrobe couldn’t be more seamless thanks to breezy yet posh linen and cotton-blend options that are perfect for the summer’s remaining heatwaves.

— Kaitlin Clapinski, InStyle, 4 Aug. 2026

Definition of perfect

Adjective

Speaking after the event, White praised the production and atmosphere, describing it as a flawless night.

— Saman Shafiq, USA Today, 4 Aug. 2026
Sterling Nasa proceeded to stun composer-conductor Justin Hurwitz and the 2,000-person audience with his flawless, impromptu performance.

— Tim Greiving, Los Angeles Times, 3 Aug. 2026

Definition of flawless

Adjective

Aside from consistent, reliable bed-to-feed patterns, the major benefit of early-season deer hunting is a lack of hunting pressure.

— Josh Honeycutt, Outdoor Life, 6 Aug. 2026
Although sustainable aviation fuel is very small segment of the market, European mandates may drive airlines to seek out reliable sources in the near future.

— Tony Briscoe, Los Angeles Times, 6 Aug. 2026

Definition of reliable

Browse Nearby Words

foolishness

foolproof

fools

See all Nearby Words

Cite this Entry

Style

“Foolproof.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foolproof. Accessed 8 Aug. 2026.

Copy Citation

Synonyms of foolproof

adjective

Example Sentences

Browse Nearby Words

Cite this Entry

More from Merriam-Webster on foolproof

More from Merriam-Webster

Word of the Day

nurture

Popular in Grammar & Usage

7 Pairs of Commonly Confused Words

Merriam-Webster’s Great Big List of Words You Love to Hate

Is it 'nerve-racking' or 'nerve-wracking'?

'Sneaked' or 'Snuck': Which is correct?

Why does English have so many silent letters?

Popular in Wordplay

The Longest Long Words List

It's a Scorcher! Words for the Summer Heat

14 Phobias You Probably Haven't Heard Of

The Words of the Week - Aug. 7

How long is a jiffy?

Popular

7 Pairs of Commonly Confused Words

The Longest Long Words List

It's a Scorcher! Words for the Summer Heat

Games & Quizzes