Other forms: perversities
When you choose to act in a way that's unreasonable, contrary, or just plain wrong, you're displaying perversity. Your perversity might lead you to throw your empty soda can on the ground instead of in the recycling bin.
Being deliberately contrary — doing the opposite of what people expect or want you to do — is one characteristic of perversity. There's also a sense inherent in this word of acting strangely or deviantly. Your perversity might mean that your jokes tend to make everyone around you feel uncomfortable. The Latin root is perversus, "turned away, contrary, or askew."