a.

1. 深思的，沉思的
   That put us all in a thoughtful mood.

   这使我们大家陷入了沉思。

2. 富有思想的；经认真推敲的
3. 细心的，注意的[F][（+of）]
   You should be more thoughtful of your behavior.

   你应该更加注意你的举止。

4. 体贴的，考虑周到的[（+about/of）]
   She is always thoughtful of her mother.

   她总是很体贴她的母亲。

adj.

1. absorbed in or involving thought.
   ▸showing careful consideration or attention.
2. showing regard for other people.