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.

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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 No method is completely foolproof, so avoiding contaminated water remains the safest strategy. — Ryan Brennan, Kansas City Star, 24 June 2026 However, essential oils are best used as a preventative measure, not a foolproof solution against wasps, says Rick Young, owner of Youngs Pest Control. — Louise Parks, Martha Stewart, 21 June 2026 This all sounds impressive enough, but even futuristic weapons like lasers are not foolproof on the battlefield. — Christopher McFadden, Interesting Engineering, 20 June 2026 Matching sets are always a foolproof way to instantly put together, and this guest's coordinating pink denim proves the point. — Amanda Le, InStyle, 20 June 2026 See All Example Sentences for foolproof

Recent Examples of Synonyms for foolproof

Adjective

In comparison, the Sparks, without an offensive rebound until the end of the third quarter, were forced to make perfect shots, though that was far from the team’s grasp.

— Liana Handler, Los Angeles Times, 7 July 2026
While no missile defense system offers perfect protection, modern layered architectures have significantly improved the ability to detect, track, and intercept increasingly sophisticated threats.

— Kaif Shaikh, Interesting Engineering, 6 July 2026

Definition of perfect

Adjective

Nathan Ngoy, of Lille, and Club Brugge’s Brandon Mechele were flawless in central defence, and the whole team were fast, sharp, energetic and slick, defending as a team and attacking as one too.

— Tim Spiers, New York Times, 7 July 2026
Upgrade to brushes that deliver a flawless, streak-free makeup application.

— ABC News, ABC News, 6 July 2026

Definition of flawless

Browse Nearby Words

foolishness

foolproof

fools

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“Foolproof.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/foolproof. Accessed 11 Jul. 2026.

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Synonyms of foolproof

adjective

Example Sentences

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