a.

1. 能，可，會[F][+to-v]
   I am afraid I won't be able to visit you on Saturday.

   恐怕我無法在星期六來拜訪您了。

2. 有能力的；能幹的
   He is an able lawyer.

   他是一位能幹的律師。

adj.

1. having the power, skill, or means to do something.
2. having considerable proficiency or intelligence.