a.

1. 不高兴的，绷着脸的；愠怒的
   Susan was sullen in the morning because she hadn't slept well.

   苏珊今天早上郁闷不乐，因为昨晚没睡好。

2. 乖戾的
3. （天气）阴沉的
   This sullen weather disagrees with me.

   遇上这种阴沉的天气我就感到不舒服。

4. （声音，颜色等）沉闷的
   The blue eyes were reddened and sullen with weeping.

   一对碧眼哭得发红，没了光辉。

5. （水流）停滞的
   A sullen stream winds its way among the trees.

   一条水流滞缓的小溪蜿蜒流经树林。

adj.