a.

1. 走上邪路的；墮落的；邪惡的
2. 故意作對的
   I felt a perverse desire to accept his challenge.

   他向我挑戰，我就偏要應戰。

3. 倔強的；剛愎自用的，乖戾的
4. 違反常情的，反常的

adj.

1. showing a deliberate and obstinate desire to behave unacceptably.
   ▸sexually perverted.
2. contrary to that which is accepted or expected.
   ▸Law  (of a verdict) against the weight of evidence or the direction of the judge.