waterproof

1 of 3

adjective

wa·​ter·​proof ˈwȯ-tər-ˌprüf 

ˈwä-

: 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 3

noun

1

: a waterproof fabric

2

chiefly British : raincoat

waterproof

3 of 3

verb

waterproofed; waterproofing; waterproofs

transitive verb

: to make waterproof

waterproofer noun

Synonyms of waterproof

Adjective

• leakproof
• staunch
• waterproofed

Noun

• slicker
• raincoat
• trench
• oilskin
• mac

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.

Recent Examples on the Web

Adjective

There are waterproof Sorel boots for rainy-day exploring, classic Adidas sneakers for casual outfits, and plenty of polished options, from slingback flats and ballet flats to easy slip-on loafers. — Chaise Sanders, Travel + Leisure, 22 Oct. 2026

Murres resemble penguins with dense, waterproof feathers that look like a tuxedo and function like a wetsuit — trapping a layer of air against their skin to keep them warm and dry, Boland said. — Stephanie Zappelli, Sacbee.com, 22 Oct. 2026

Noun

Arc’teryx said the Sperro SV jacket was developed with Gore-Tex testing expertise and is made to meet Gore-Tex’s durable waterproof, windproof and breathable performance standards. — Arthur Zaczkiewicz, Footwear News, 28 Aug. 2026

Finally, cover outlets that aren’t waterproof-rated, advises Dewey. — Louise Parks, Martha Stewart, 1 Aug. 2026

Verb

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

The actors’ costumes are not waterproofed, however, and the cast gets soaked. — Jenelle Riley, Los Angeles Times, 6 Oct. 2026

Word History

First Known Use

Adjective

1725, in the meaning defined above

Noun

1788, in the meaning defined at sense 1

Verb

1820, in the meaning defined above

Rhymes for waterproof

• bulletproof
• fireproof
• weatherproof
• aloof
• behoof
• disproof
• flameproof
• foolproof
• greaseproof
• leakproof
• reproof
• soundproof

Kids Definition

waterproof

1 of 3 adjective

wa·​ter·​proof -ˌprüf 

: 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