a.

1. 走上邪路的；堕落的；邪恶的
2. 故意作对的
   I felt a perverse desire to accept his challenge.

   他向我挑战，我就偏要应战。

3. 倔强的；刚愎自用的，乖戾的
4. 违反常情的，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.