Perverse (adjective)

1. Determined to behave in a way that is unacceptable or unacceptable.
2. Contrary to what is expected or normal.

Origin:

Middle english, from latin perversus, from past participle of pervertere to turn around, mislead, from per- + vertere to turn.

Examples:

1. The child had a perverse streak.
2. He has a perverse sense of humor.
3. She had a perverse desire to hurt herself.
4. His actions were considered perverse.
5. The perverse weather conditions made it impossible to continue the hike.