nebulous

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

The notions we children were able to form of the great world beyond were exceedingly nebulous. 我們這些孩子對(duì)外部世界所能形成的認(rèn)識(shí)是非常模糊的。

Music is such a nebulous thing. 音樂(lè)是如此朦朧之物。