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
waterproofed; waterproofing; waterproofs
: to make waterproof
waterproofer
noun
Synonyms of waterproof
Relevance
Adjective
Noun
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
Melinda Moore, Chicago Tribune, 26 Mar. 2026
Best Picks for Adventuring Merrell Moab 3 Waterproof A contoured footbed, superior shock absorption, a grippy Vibram outsole, and waterproof upper make this shoe ready for all-conditions adventure.
—Lisa Jhung, Outside, 26 Mar. 2026
Eric Zeman, PC Magazine, 20 Mar. 2026
The innovative manufacturing process entails the knit layer of the garment being bonded to the high-performance HDry waterproof and breathable membrane via a 3D technique whereby the finished garments is placed on an inflatable mannequin with the membrane beneath it.
—Martino Carrera, Footwear News, 16 Jan. 2026
Dejanay Booth-Singleton, CBS News, 21 Mar. 2026
Additionally, waterproofing measures will contribute to the longevity of the outdoor kitchen.
—Megan Johnson, Architectural Digest, 12 Mar. 2026
See All Example Sentences for waterproof
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
The waterproof mats, about 3 feet wide and 6 feet long, take 500 to 700 bags to complete.
—Melinda Moore, Chicago Tribune, 26 Mar. 2026
Best Picks for Adventuring Merrell Moab 3 Waterproof A contoured footbed, superior shock absorption, a grippy Vibram outsole, and waterproof upper make this shoe ready for all-conditions adventure.
—Lisa Jhung, Outside, 26 Mar. 2026
Noun
Other than making the tablet waterproof and adding Face ID, there's not much left to improve.
—Eric Zeman, PC Magazine, 20 Mar. 2026
The innovative manufacturing process entails the knit layer of the garment being bonded to the high-performance HDry waterproof and breathable membrane via a 3D technique whereby the finished garments is placed on an inflatable mannequin with the membrane beneath it.
—Martino Carrera, Footwear News, 16 Jan. 2026
Verb
Bloomfield Township police said the workers used the torch to warm rubber flashing as part of a waterproofing process.
—Dejanay Booth-Singleton, CBS News, 21 Mar. 2026
Additionally, waterproofing measures will contribute to the longevity of the outdoor kitchen.
—Megan Johnson, Architectural Digest, 12 Mar. 2026
See All Example Sentences for waterproof
Cite this Entry
“Waterproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/waterproof. Accessed 2 Apr. 2026.
Copy CitationLove words? Need even more definitions?
Merriam-Webster unabridged
