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
wa·ter·proof·er
"+ə(r)
: one that waterproofs something (as roofs or fabrics): such as
a
: a worker who waterproofs something manually or mechanically
b
: a waterproofing material (as for roofs)
Synonyms of waterproof
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Adjective
Noun (1)
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 (1)
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
Sophie Dodd, Travel + Leisure, 12 June 2026
And use all the proper types of sunblock and waterproof, too.
—Scott Fowler, Charlotte Observer, 10 June 2026
Pamela Brill, Parents, 7 Apr. 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
Timothy Dale, The Spruce, 29 May 2026
Most recently, analysis of pollen trapped in the ship’s waterproofing layers have yielded insight into repairs made successively in other locations throughout the Adriatic Sea, according to a paper published in the journal Frontiers in Materials.
—ArsTechnica, 2 May 2026
See All Example Sentences for waterproof
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Adjective
The durable, waterproof material is easy to wash and comfortable to wear for hours at a time, thanks to shock-absorbing midsoles and ridged, grippy outsoles.
—Sophie Dodd, Travel + Leisure, 12 June 2026
And use all the proper types of sunblock and waterproof, too.
—Scott Fowler, Charlotte Observer, 10 June 2026
Noun
The super-absorbent top layer is designed to tackle spills while the waterproof back keeps your little one’s clothing dry.
—Pamela Brill, Parents, 7 Apr. 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
Most recently, analysis of pollen trapped in the ship’s waterproofing layers have yielded insight into repairs made successively in other locations throughout the Adriatic Sea, according to a paper published in the journal Frontiers in Materials.
—ArsTechnica, 2 May 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 13 Jun. 2026.
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