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
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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
Samantha Leal, Travel + Leisure, 21 Dec. 2025
The boots are constructed with vulcanized rubber that’s durable, waterproof, and built to handle any wet weather condition.
—Alicia Geigel, Southern Living, 20 Dec. 2025
New Atlas, 13 Dec. 2025
The Charge 6 is IP68 waterproof, has a 24-hour battery life, and USB-C lossless for audiophiles.
—PC Magazine, 22 Nov. 2025
Laura Baisas, Popular Science, 10 Dec. 2025
Companies measure waterproofing in millimeters (mm).
—Nathan Allen, Travel + Leisure, 14 Nov. 2025
See All Example Sentences for waterproof
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Adjective
Compact yet surprisingly comprehensive, the Welly kit includes flexible fabric bandages, waterproof options, non-stick pads, tape, cleansing wipes, and single-use antibiotic ointments.
—Samantha Leal, Travel + Leisure, 21 Dec. 2025
The boots are constructed with vulcanized rubber that’s durable, waterproof, and built to handle any wet weather condition.
—Alicia Geigel, Southern Living, 20 Dec. 2025
Noun
The rainfly is a thinner 180-gsm poly ripstop waterproof-rated to 8,000 mm and coated in a black-out finish of its own.
—New Atlas, 13 Dec. 2025
The Charge 6 is IP68 waterproof, has a 24-hour battery life, and USB-C lossless for audiophiles.
—PC Magazine, 22 Nov. 2025
Verb
However, there was one other clue of note: the partial human fingerprint in the caulking material used to waterproof the boat.
—Laura Baisas, Popular Science, 10 Dec. 2025
Companies measure waterproofing in millimeters (mm).
—Nathan Allen, Travel + Leisure, 14 Nov. 2025
See All Example Sentences for waterproof
Cite this Entry
“Waterproof.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/waterproof. Accessed 23 Dec. 2025.
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