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

Adjective

• leakproof
• waterproofed

Noun

• mac [British]
• mack
• mackintosh [chiefly British]
• macintosh
• oilskin
• raincoat
• slicker

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

From comfortable shoes to a waterproof phone case, here are 17 cruise essentials in my Amazon cart that would come in handy on your next trip, too. —Rebecca Shinners, Travel + Leisure, 19 Apr. 2024

Please wear clean waterproof boots, bring a headlamp or flashlight and a sanitized dipping net. —Karl Schneider, The Indianapolis Star, 18 Apr. 2024

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

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