闷闷不乐的

例句：

1. 1.He mumbled something about needing to go to the bathroom.
   他小声说了点什么，好像要去洗手间。
2. 2. The old man mumbled his way through the story.
   老人含糊其辞地讲述了这个故事。
3. 3. She mumbled a few words before she left the room.
   她离开房间前低声说了几句话。