After moving to a new city, he started feeling isolated from his old friends.

isolated 是动词 isolate 的过去分词形式，isolate 由词根 isol（来自拉丁语 insula，意为"岛屿"）和后缀 -ate（表示"使成为"）组成，字面意思是"使成为孤岛"，引申为"使隔离、使孤立"。 在句中 isolated 表示"感到被孤立的、与外界隔绝的"心理状态。