Word.ws English Dictionary

waterfast

waterfast adjective: watertight.

Adjective

waterfast (comparative more waterfast, superlative most waterfast)

  1. watertight
  2. waterproof
    • 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.1953, August G. Lockwood, Norman E. Stanton, How to Finish Your Attic and Basement Yourself, page 166
    • A waterfast sunscreen, in other words, a product that stays on well despite swimming or heavy perspiration, is also advisable.2000, Nelson Novick M.D, Baby Skin

Forms of waterfast

comparativemore waterfast
superlativemost waterfast

Origin of waterfast

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

Questions about waterfast

What does waterfast mean?
Waterfast means watertight.
What part of speech is waterfast?
Waterfast is an adjective.

Words near waterfast in the dictionary

  1. waterfalled
  2. waterfalling
  3. waterfallish
  4. waterfalls
  5. waterfaring
  6. waterfast
  7. Waterfield
  8. Waterfields
  9. waterfilled
  10. waterfilling
  11. waterfinder

Source and license

Adapted from Wiktionary: waterfast (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “waterfast.” Word.ws, https://word.ws/waterfast. Based on Wiktionary, CC BY-SA 4.0.