This is the 9275th most frequent Japanese word.
痛ん
"痛ん" is the stem form of "痛む," meaning "to hurt" or "to be damaged."
In this sentence, '痛んだ' is used as an adjective in the past participle form to describe the roof ('屋根') that has deteriorated or been damaged.
彼は古い家を見て、痛んだ屋根について話しました。
He looked at the old house and talked about the damaged roof.
Here, '痛んだ' again functions as an adjective describing the fruits ('果物') that have decayed or gone bad.
痛んだ果物は取り除いて新鮮な物を選んでください。
Please remove damaged fruits and choose fresh ones.
In this context, '痛んだ' describes the furniture ('家具') as being worn out or damaged, emphasizing the need for repair.