waterproofness en · NOUN
Etymology
Etymology tree English waterproof Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English waterproofness From waterproof + -ness.
Meanings
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(uncountable) The property of being waterproof.
To find the best rain jacket, we tested everything from waterproofness and breathability to fit, feel and packability.
2025 January 3, Kai Burkhardt, “The best rain jackets of 2025, tried and tested”, in CNN:In the fabric section, a textile twisting and tearing machine and a "Lissajou curve" [sic] abrader (covering a complete area in overlapping curves) are supplemented by apparatus for evaluating waterproofness, fibre diameter and light-fastness.
1961 February, “Talking of Trains: New L.T. research laboratory”, in Trains Illustrated, page 77: