Definition of waterproofness in English:

waterproofness

noun

See waterproof

‘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.’