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Pronunciation varies by accent · adjective
(of a surface coating or chemical spray) That is not washed off by the rain.
Use rainfast when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Rainfast means (of a surface coating or chemical spray) That is not washed off by the rain.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use rainfast where its definition matches the intended context.
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