perversity

perverse +‎ -ity, from Middle French perversité, from Latin perversitās.

• IPA^(key): /pə(ɹ)ˈvɜː(ɹ)sɪti/

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perversity (countable and uncountable, plural perversities)

1. The quality of being perverse.
2. Something which is perverse.
   • 1995, Andreu Mas-Colell, Michael D. Whinston, and Jerry R. Green, Microeconomic Theory, Oxford University Press, page 112:

     More generally, for the ULD property to hold, the substitution effects (which are always well behaved) must be large enough to overcome possible “perversities” coming from the wealth effects.