waterproof

1 of 4

adjective

wa·​ter·​proof ˈwȯ-tər-ˌprüf How to pronounce waterproof (audio)
ˈwä-
Synonyms of waterproofnext
: impervious to water
especially : covered or treated with a material (such as a solution of rubber) to prevent permeation by water
waterproofness noun

waterproof

2 of 4

noun (1)

1
: a waterproof fabric
2
chiefly British : raincoat

waterproof

3 of 4

verb

waterproofed; waterproofing; waterproofs

transitive verb

: to make waterproof
waterproofer noun

waterproofer

4 of 4

noun (2)

wa·​ter·​proof·​er
"+ə(r)
: one that waterproofs something (as roofs or fabrics): such as
a
: a worker who waterproofs something manually or mechanically
b
: a waterproofing material (as for roofs)

Synonyms of waterproof

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Adjective

Noun (1)

See All Synonyms & Antonyms in Thesaurus

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 (1) remember your waterproof if you're walking around London in the winter Verb He waterproofed the deck by applying sealer to it.
Recent Examples on the Web
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.
Adjective
Lead is a durable, waterproof material widely used for decades across the country to connect main water lines to homes and other buildings. — Richard Day, Chicago Tribune, 29 Oct. 2026 Each shoe in the Kith x Timberland winter 2026 range is built with waterproof nubuck and features stitched nubuck Kith patches on its upper. — Riley Jones, Footwear News, 29 Oct. 2026
Noun
Engineered with bold resonant audio and booming bass, an IP67 waterproof and dustproof exterior, up to 20 hours of battery life, and convenient USB-C charge-out support, it is built for every chaotic adventure. — Juhi Wadia, PC Magazine, 30 Oct. 2026 Revlon’s waterproof and transfer-proof claims also make the formula appealing for longer-lasting makeup, although the brand’s wear claims apply to eyebrow use. — Ashley Lynch, Miami Herald, 21 Oct. 2026
Verb
Underneath that new shell, however, nothing has changed, so the hardware is still sluggish and lacks waterproofing. — Will Greenwald, PC Magazine, 21 Oct. 2026 Products like inflatable dams, flood barriers that attach to doors more like dog gates or even good ol’ fashioned waterproofing tapes and foams are generally fine to install. — Alex Harris, Miami Herald, 16 Oct. 2026 See All Example Sentences for waterproof

Word History

First Known Use

Adjective

1725, in the meaning defined above

Noun (1)

1788, in the meaning defined at sense 1

Verb

1820, in the meaning defined above

Time Traveler
The first known use of waterproof was in 1725

Rhymes for waterproof

See All Rhymes for waterproof

Browse Nearby Words

water privilege
waterproof
waterproofer
See all Nearby Words

Cite this Entry

“Waterproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/waterproof. Accessed 1 Nov. 2026.

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Kids Definition

waterproof

1 of 3 adjective
wa·​ter·​proof -ˌprüf How to pronounce waterproof (audio)
: not letting water through
especially : covered or treated with a material to prevent penetration by water

waterproof

2 of 3 noun
chiefly British
: raincoat

waterproof

3 of 3 verb
: to make waterproof
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