n.[U]

1. 明亮；光亮度
   The lightness of the sky showed that the rain was really over.

   天空明亮表示雨確已停了。

2. （顏色的）淺淡

n.[U]

1. 輕，輕微
2. 輕快，敏捷
3. 愉快；輕鬆
   That gave one sense of lightness.

   它給人一種輕鬆感。

4. 輕率；輕浮
   Such lightness of conduct is not to be permitted in church.

   做禮拜時，不允許這種輕浮行為。