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
New Atlas, 15 Nov. 2025
Mountain Hardwear employs a 3-Layer Gore-Tex Pro ePE shell fabric that is incredibly durable, waterproof, ultralight, and constructed with recycled materials.
—Nathan Allen, Travel + Leisure, 14 Nov. 2025
Nathan Allen, Travel + Leisure, 14 Nov. 2025
There’s a lot to love, from the waterproof, stretchy three-layer softshell outer fabric to the generous kangaroo pocket and the brilliant dropseat design that makes bathroom breaks easy.
—Jenny Wiegand, Outside, 14 Nov. 2025
Nathan Allen, Travel + Leisure, 14 Nov. 2025
Elsewhere, Kaufman heads into the water sans waterproofing, gray corduroy suit and gingham shirt soaked.
—Hannah Jackson, Vogue, 30 Oct. 2025
See All Example Sentences for waterproof
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Adjective
An effective waterproof base about the thickness of a coating of paint was produced after three days of fungus growth in warm conditions, and by the fourth day the coating produced patchy yellow, orange or tan markings.
—New Atlas, 15 Nov. 2025
Mountain Hardwear employs a 3-Layer Gore-Tex Pro ePE shell fabric that is incredibly durable, waterproof, ultralight, and constructed with recycled materials.
—Nathan Allen, Travel + Leisure, 14 Nov. 2025
Noun
Helly Hansen employs some of its proprietary waterproof and breathable materials, including PrimaLoft Black Eco insulation, a PFC-free DWR treatment, and various ventilation options.
—Nathan Allen, Travel + Leisure, 14 Nov. 2025
There’s a lot to love, from the waterproof, stretchy three-layer softshell outer fabric to the generous kangaroo pocket and the brilliant dropseat design that makes bathroom breaks easy.
—Jenny Wiegand, Outside, 14 Nov. 2025
Verb
Companies measure waterproofing in millimeters (mm).
—Nathan Allen, Travel + Leisure, 14 Nov. 2025
Elsewhere, Kaufman heads into the water sans waterproofing, gray corduroy suit and gingham shirt soaked.
—Hannah Jackson, Vogue, 30 Oct. 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 24 Nov. 2025.
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