His admiration for the singer borders on idolatry, with posters covering his room walls.

idolatry 是名词，由 idol（偶像）和后缀 -atry（表示"崇拜"）组成。idol 来自希腊语 eidolon，意为"形象、偶像"，-atry 来自希腊语 -atreia，表示"崇拜行为"。合起来指"偶像崇拜"，常带有过度崇拜的负面含义。