She was clearly irritated by the repeated delays in the project.

irritated 是动词 irritate 的过去分词形式，在句中表示被动状态。irritate 由词根 irrit（刺激、激怒）和动词后缀 -ate 组成，意思是"使恼怒、使烦躁"。irritated 表示"被激怒的、感到烦躁的"。