He felt his privacy was violated when someone read his private diary without permission.

violated 是动词 violate 的过去分词形式，在句中表示被动。violate 由词根 viol（表示"力量"或"侵犯"）和后缀 -ate（表示"使成为"）组成，意思是"侵犯、违反"。violated 在这里表示"被侵犯"的状态。