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"waterproof" is correct and usable in written English.
It is used to describe something that is made or treated so that it does not allow water to pass through it. For example, "My raincoat is waterproof so I don't need an umbrella when it's raining."
Exact(60)
With a waterproof inner for your rucksack (try Ortlieb), a plastic bag for your shoes, and perhaps a wetsuit, you're all set.
Mountain Equipment windproof beanie with OMM Kamleika waterproof cap.
A square-screened device running Android Wear software, with GPS built in, three-day battery life, and a waterproof design.
On one occasion I was forced to buy secondhand pants and on an extremely rainy bank holiday in north Wales I lapsed and had to buy a waterproof after I lost my jacket.
The young pair, Mouhammed Yusef al-Mnger and Aisha Mouhammed Jeblawi, in matching nylon tracksuits and rucksacks, are unwrapping their phones from makeshift waterproof plastic coverings.
While some notes published in his lifetime mention things that did not need to be acted upon – like using a Rembrandt as an ironing board – the notes that became available posthumously include the following: "take one cubic centimetre of tobacco smoke and paint the exterior and the interior surfaces a waterproof colour"; "trace a straight line on Rodin's The Kiss as seen from a sight".
So while in Japan you can easily stumble across a remote-control tissue box or a battery-operated planetarium for your bathroom (by which I mean a waterproof Saturn-shaped orb that floats in the bath and projects the entire visible universe onto the ceiling), the sense of surrounding novelty has diminished.
Put together, it was a collection that – with a pair of waterproof boots, perhaps – could have walked straight off the runway and on to the streets outside.
As someone who can suffer from cold hands I went for the overkill option with Seal Skinz waterproof all-weather cycling gloves, which kept my fingers warm during last winter's sub-zero temperatures.
Another round-screened Android Wear device, this is chunky but its battery lasts for two days, and it's also waterproof.
Waterproof overshoes Cycling shoes with cleats are the best winter investment you can make.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com