waterfast

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English

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Etymology

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From water +‎ fast. Cognate with Scots wattirfast (watertight), West Frisian wetterfêst (waterproof), Dutch watervast (waterproof), German wasserfest (waterproof), Danish vandfast (waterproof), Swedish vattenfast (waterproof).

Adjective

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waterfast (comparative more waterfast, superlative most waterfast)

  1. watertight
  2. waterproof
    • 1953, August G. Lockwood, Norman E. Stanton, How to Finish Your Attic and Basement Yourself, page 166:
      If you spot paste, and your paper is waterfast, wipe at once with a damp cloth or sponge. If the paper is not waterfast, wipe with a dry cloth.
    • 2000, Nelson Novick M.D, Baby Skin:
      A waterfast sunscreen, in other words, a product that stays on well despite swimming or heavy perspiration, is also advisable.