1. Unaffected by water.
  2. Made of or covered with material that doesn't allow water in.
  3. (figurative) Incapable of failing; unassailable.
    • 1931, The British Clay Worker
      The only waterproof plan and the one increasingly adopted by leading trades is the consolidation of the interests of all parties in a scheme of amalgamation.
    • 2001, W. A. M. van Dijk, J. L. Hovens, Netherlands. Koninklijke Marechaussee, Arresting war criminals
      Especially within an international framework, guarding this process is of the utmost importance. The eyes of the world are focussed on the action at hand and demand a waterproof plan and execution.
    • 2013, Barry Davies, Soldier of Fortune Guide to How to Disappear and Never Be Found, Skyhorse Publishing, Inc. ISBN 9781626365216
      Unless you have a 100 percent waterproof plan to defraud insurance companies, I would suggest you don't do it.
  • (made of a material that doesn't allow water in) watertight
Translations Translations Verb

waterproof (waterproofs, present participle waterproofing; past and past participle waterproofed)

  1. To make waterproof or water-resistant.
  • French: étanchéifier
  • Italian: impermeabilizzare
  • Spanish: impermeabilizar

waterproof (plural waterproofs)

  1. A substance or preparation for rendering cloth, leather, etc., impervious to water.
  2. Cloth made waterproof, or any article made of such cloth, or of other waterproof material, as rubber; especially, an outer garment made of such material.

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