Definition of waterproof in English:

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Pronunciation: /ˈwôdərˌpro͞of/
Pronunciation: /ˈwädərˌpro͞of/


1Impervious to water: a waterproof hat
More example sentences
  • You'd think I'd know better, wouldn't you, than to look at a clear November sky and decide to leave my hat and my waterproof coat behind?
  • She slipped on waterproof shoes and a woolen hat.
  • Although it doesn't claim to be waterproof, it is highly weather resistant.
1.1Not liable to be washed away by water: waterproof ink
More example sentences
  • This waterproof coating will not wash off, thicken in cold conditions or attract dirt like oil lubricants do.
  • In a smart move he's bought in a large batch of waterproof ink.
  • Their waterproof inks and papers also guarantee serious longevity.


A garment, especially a coat, that keeps out water.
Example sentences
  • With the pre-match formalities over the players peel off the waterproofs and are set for action.
  • It is very important to wear really good quality waterproofs.
  • I like to take a good set of waterproofs because when it rains it pours.


[with object]
Make impervious to water.
Example sentences
  • This week, one team has to find a way of waterproofing a tent to take on an expedition, while the other team builds a seismograph out of an old alarm clock.
  • Work includes repointing and waterproofing the tower and is expected to start shortly as the weather warms up.
  • Many kinds of vehicles were waterproofed for D-Day, including tanks and jeeps.



Example sentences
  • I've had one waterproofer come out for an estimate, which I don't have yet but expect to be substantial (he wants to dig down to the foundation, apply a rubber/polymer layer to the wall, then recover the wall, regrade, and put in a drain).
  • Mid-Co is one of the best waterproofers out there.
  • Consumers who buy three gallons of waterproofers can mail in proof of purchase to receive a baseball valued at $75 and autographed by one of the Hall of Famers.


Example sentences
  • There are countless models on the market, but most involve some compromise between breathability and true waterproofness.
  • Regarding footwear, waterproofness is likely to be more important than warmth.
  • As a result, latex modified mortar and concrete have an improved waterproofness over ordinary mortar and concrete.

For editors and proofreaders

Syllabification: wa·ter·proof

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