What does water fast mean?
Water fast means watertight.
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Pronunciation varies by accent · adjective
watertight.
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.
Use water fast when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Water fast means watertight.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
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.
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