wa·​ter·​proof | \ ˈwȯ-tər-ˌprüf How to pronounce waterproof (audio) , ˈwä- \

Definition of waterproof

 (Entry 1 of 3)

: impervious to water especially : covered or treated with a material (such as a solution of rubber) to prevent permeation by water



Definition of waterproof (Entry 2 of 3)

1 : a waterproof fabric
2 chiefly British : raincoat


waterproofed; waterproofing; waterproofs

Definition of waterproof (Entry 3 of 3)

transitive verb

: to make waterproof

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Other Words from waterproof


waterproofness noun


waterproofer noun

Synonyms for waterproof

Synonyms: Adjective

Synonyms: Noun

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Examples of waterproof in a Sentence

Adjective This suntan lotion is waterproof. luckily, my backpack is waterproof, so my clothes didn't get wet Noun remember your waterproof if you're walking around London in the winter Verb He waterproofed the deck by applying sealer to it.
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Recent Examples on the Web: Adjective This anorak-style one is completely waterproof, featuring both a zipper and snaps to protect your outfit from the elements. Kara Cuzzone, Forbes, "Behold, The 7 Best Things To Buy At Madewell’s Spring Sale," 6 Apr. 2021 The look had to be completely waterproof, after all. Sarah Midkiff, refinery29.com, "Kerry Washington Matched Her Mermaid Manicure To Her Swimming Cap," 5 Apr. 2021 Some are even completely waterproof, like Yeti's Panga duffel bag. Travel + Leisure, "The 20 Best Duffel Bags for Travel, According to Reviews," 12 Mar. 2021 Its waterproof construction keeps you warm and dry, while reflective material throughout enhances your safety in low-light conditions. Outdoor Life Commerce Team, Outdoor Life, "Best Ice Fishing Bibs: Stay Warm on the Hard Water," 25 Feb. 2021 Some options are waterproof, helping to keep your feet warm and dry. Anthony Marcusa, chicagotribune.com, "The best men’s TOMS shoe," 19 Mar. 2021 King recommends avoiding waterproof formulas that will dry your lashes out and are harder to remove. Audrey Noble, Harper's BAZAAR, "Can Castor Oil Make Your Eyelashes Grow Faster?," 22 July 2020 The base material is waterproof and treated for even longer-lasting build. Chris Hachey, BGR, "Best Baseball and Softball Bat Bag," 12 Mar. 2021 For hurricane prep, be sure your emergency radio is waterproof. Popular Science, "Emergency radios for unpredictable times," 1 Mar. 2021 Recent Examples on the Web: Noun This waterproof, Bluetooth-compatible pick had Amazon shoppers raving over its handy sound booster, which can be used to amplify its bass. Melissa Lee, USA TODAY, "The 5 best Amazon deals you can get this Wednesday," 1 Apr. 2021 The handset is rated IP68 and IP69 for sand, dust, and dirt resistance and waterproof to 5 feet for 35 minutes. Chris Smith, BGR, "If you need a rugged phone, Caterpillar’s latest model might do," 1 Apr. 2021 And high-quality winter hiking boots are also pretty darn waterproof. Outdoor Life, "Best Winter Boots for Men: Leather Boots, Insulated Work Boots, and More," 22 Feb. 2021 Its shell is made from a heavy waterproof, windproof, breathable material with four-way stretch. The Popular Mechanics Editors, Popular Mechanics, "Gear of the Year: The Best Products We Tested in 2020," 29 Dec. 2020 Like the bibs, this outer layer has a 100 percent waterproof, windproof, and breathable exterior and heavy-duty zippers. Ben Romans, Outdoor Life, "The Best Bass Pro Black Friday Deals: Early Bargains on Fishing, Hunting, and Outdoor Gear," 18 Nov. 2020 The bag is designed to circulate the air and ozone evenly and the waterproof, air-tight zippers ensure no odors penetrate to the clothes inside. The Editors, Field & Stream, "The Best Cabela’s Cyber Monday Deals: Early Bargains Before the Holiday," 16 Nov. 2020 As for the waterproof, oil-controlling foundation, 98% of customers would recommend snagging this formula thanks to its gorgeous sheen. Melissa Lee, USA TODAY, "Macy's is having a huge beauty sale right now—here's how to save," 26 Aug. 2020 Add a little ambiance to hot tub soaking sessions with this waterproof, floating Bluetooth speaker and LED light show. Dana Holmes, CNN Underscored, "Inflatable hot tubs that bring the spa to your backyard," 26 Aug. 2020 Recent Examples on the Web: Verb Compatible with both the Peloton bike and app, not to mention iPhones and Androids and more than 50 fitness apps, the hand-washable strap and sensor are ultra-lightweight and waterproof up to 5 feet. Courtney Thompson, CNN Underscored, "Maximize your Peloton ride with these top-selling heart rate monitors on Amazon," 13 Aug. 2020 William Drsek, the city’s public works commissioner, told the committee in a memo that the lowest bid from among three contractors for waterproofing the basement was $23,450. Ed Wittenberg, cleveland, "Solon City Council approves proposal to renovate historic Bull house," 7 Apr. 2020 The next boot care step is waterproofing your leather hunting boots so your feet stay not only warm and comfortable, but also dry when worn in inclement weather. The Editors, Field & Stream, "How to Care for Leather Boots," 3 Mar. 2020 The next boot-care step is waterproofing your best outdoor pair so your feet stay warm and dry when worn in inclement weather. Popular Science, "The best, proven way to make your leather boots last," 10 Mar. 2020 These have guards for your shins, buckles that won’t catch on anything, and waterproofing for rain or off-road riding. Alexander George, Popular Mechanics, "All the Best Motorcycle Gear You Need to Start Riding," 5 Mar. 2020 Note that many people choose not to waterproof their leather boots that have a Gore-Tex or similar lining that prevents water from reaching their feet. The Editors, Field & Stream, "How to Care for Leather Boots," 3 Mar. 2020 Or at the very least, waterproofing the lower few feet of a pier’s outer walls. John King, SFChronicle.com, "Buffing up San Francisco’s historic piers to survive sea level rise," 6 Feb. 2020 That's mostly due to the cost of the waterproof testing machine, not the parts actually used to waterproof the device. Courtney Linder, Popular Mechanics, "How to Waterproof a Watch in 10 Easy Steps," 5 Jan. 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'waterproof.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of waterproof


1725, in the meaning defined above


1788, in the meaning defined at sense 1


1820, in the meaning defined above

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Time Traveler for waterproof

Time Traveler

The first known use of waterproof was in 1725

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Statistics for waterproof

Last Updated

11 Apr 2021

Cite this Entry

“Waterproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/waterproof. Accessed 13 Apr. 2021.

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More Definitions for waterproof



English Language Learners Definition of waterproof

 (Entry 1 of 2)

: designed to prevent water from entering or passing through
: designed so that water alone will not remove it



English Language Learners Definition of waterproof (Entry 2 of 2)

: to put a substance on (something) in order to make it waterproof


wa·​ter·​proof | \ ˌwȯ-tər-ˈprüf How to pronounce waterproof (audio) , ˌwä- \

Kids Definition of waterproof

 (Entry 1 of 2)

: not letting water through a waterproof tent


waterproofed; waterproofing

Kids Definition of waterproof (Entry 2 of 2)

: to make something resistant to letting water through

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Comments on waterproof

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