a.

1. 友好的，亲切的[（+to/towards）]
   He's not very friendly towards newcomers.

   他对新来的人不太友好。

2. 朋友关系的[F][（+with）]
   He got friendly with a young engineer.

   他与一位年轻的工程师交上了朋友。

3. 支持的，赞成的[F][（+to）]
   This company has never been friendly to change.

   这家公司从来不赞成变化。

4. 便利的；合适的
   a friendly wind

   顺风

adj.

1. kind and pleasant; of or like a friend.
2. [in combination] not harmful to a specified thing:
   an environment-friendly policy.
3. Military  of, belonging to, or allied with one's own forces.
4. favourable or serviceable.

n.