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Mildewed
Fungus Damage
Use 'mildewed' when something is damaged by fungus, indicating it's usually damp and smelly. 
Negative Sensation
'Mildewed' suggests a strong unpleasant smell and feel, which is important to express disgust or disapproval. 
Poor Condition
Describe objects in poor condition with 'mildewed' to emphasize neglect or decay. 