The condition of the bridge has deteriorated noticeably over the past decade due to lack of maintenance.

deteriorated 是动词 deteriorate 的过去分词形式。deteriorate 由前缀 de-（表示"向下、变坏"）和拉丁词根 terior（"更坏的"）组成，意思是"恶化、变坏、退化"。deteriorated 表示"已经恶化"的状态。