Superlative form of damp: the most wet or moist, or the most gloomy or sad.
From 'damp' with the superlative suffix '-est,' following the pattern of comparatives in English (damp > damper > dampest).
Superlatives like 'dampest' remind us that weather can have moods—'the dampest day' sounds sadder than 'the moistest day,' even though they mean the same thing!
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