The house turned out to be uninhabited, as my brother had said.

uninhabited 是由前缀 un-（表示"否定"）和动词 inhabit（居住）的过去分词 inhabited 组合而成。inhabit 来自拉丁语 habitare（居住），加上表示"进入"的前缀 in-。 uninhabited 字面意思是"未被居住的"，即"无人居住的"。