nebulous

1. ADJ If you describe something as nebulous, you mean that it is vague and not clearly defined or not easy to describe. 朦胧的; 模糊的

The notions we children were able to form of the great world beyond were exceedingly nebulous. 我们这些孩子对外部世界所能形成的认识是非常模糊的。

Music is such a nebulous thing. 音乐是如此朦胧之物。