a.

1. 鱼的
2. 似鱼的
3. 【口】可疑的；靠不住的
   His excessive politeness seemed fishy.

   他礼貌过度周到，令人觉得有些可疑。

   There was something fishy about that guy.

   那家伙行为可疑。

4. 无表情的

adj.

1. relating to or resembling fish or a fish.
2. informal arousing doubt or suspicion.