a.

1. 易于……的；有……倾向的；[F][+to-v]
   John is apt to be impulsive.

   约翰易冲动。

2. 恰当的，贴切的
   It was an apt remark.

   这话讲得得体。

3. 聪明的，反应敏捷的[（+at）]
   He is apt at painting.

   他善于绘画。

adj.

1. appropriate; suitable.
2. (apt to do something) having a tendency to do something.
3. quick to learn.