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

And if Mother Nature chooses to rain on your parade, the Soundcore Boom 2 Plus is completely protected from dust and water with its IPX7 waterproof rating. — Kelsey Fogarty, PC Magazine, 4 Nov. 2026

Benally, an assistant professor at Utah State University, has been coordinating deliveries of bottled water, waterproof boots, toiletries and other supplies to shelters. — Christopher Weber, Chicago Tribune, 3 Nov. 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

The water and stain spray protects leather uppers and straps; the cleaner and refresher solution is a non-aerosol spray that cleans the footbed; and the cork sealer waterproofs the cork sole and protects it from drying out and becoming brittle. — Stephanie Osmanski, Better Homes & Gardens, 30 Oct. 2026

Underneath that new shell, however, nothing has changed, so the hardware is still sluggish and lacks waterproofing. — Will Greenwald, PC Magazine, 21 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