adjective
a word that describes or modifies a noun, in this case, 'mildewed' describes something that has been affected by mildew
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The old books in the library had become mildewed due to the high humidity.
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I found some mildewed towels in the back of the closet that need to be washed.
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Ew, those shoes are so mildewed, you need to get rid of them.
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His mind had become mildewed from years of isolation and lack of stimulation.