waterfast

W4A1T1E1R1F4A1S1T1

adjective

watertight

Scrabble 15
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Meanings

adjectivewaterfast (comparative more waterfast, superlative most waterfast)

comparative more waterfast · superlative most waterfast

  1. watertight
  2. waterproof

    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
    1 more example

    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

Synonyms & antonyms

Also see
waterproofwatertight

Origin

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

Full word history & related roots →
Cite this entry
APA

waterfast. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/waterfast

MLA

“waterfast.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/waterfast. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “waterfast,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/waterfast.

Source: waterfast on Wiktionary, CC BY-SA 4.0.