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

This pack comes with four waterproof, spacious dustbags big enough for bulky sneakers and heels alike, which flight attendants say still hold up after consistent use. — Julia Morlino, Travel + Leisure, 30 June 2026

The swivel chairs feature plush cushions that are also waterproof, removable, and washable. — Stephanie Osmanski, Better Homes & Gardens, 26 June 2026

Noun

And use all the proper types of sunblock and waterproof, too. — Scott Fowler, Charlotte Observer, 10 June 2026

Other than making the tablet waterproof and adding Face ID, there's not much left to improve. — Eric Zeman, PC Magazine, 20 Mar. 2026

Verb

In most cases, the waterproofing product will take about two to four hours to dry to the touch. — Timothy Dale, The Spruce, 29 May 2026

Pitch is a black, tar-like substance that was once commonly used for waterproofing boats. — Atharva Gosavi, Interesting Engineering, 9 June 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