a.

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

   約翰易於衝動。

2. 恰當的，貼切的
   It was an apt remark.

   這話講得得體。

3. 聰明的，反應敏捷的[（+at）]
   He is apt at painting.

   他善於繪畫。

adj.

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