Waterfast
"Waterfast" in a Sentence (2 examples)
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.
A waterfast sunscreen, in other words, a product that stays on well despite swimming or heavy perspiration, is also advisable.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.