Several people were discussing a new woman we had met. The woman had been married a few times and is quite attractive. The question arose about the woman’s prospect for remarriage. This led the group to discuss the spontaneous elements in a woman that invariably makes her appealing to men.
We concluded that this quality of vigor, defiance and enthusiasm should be called zanity.
The word is created from zany, just as vanity comes from vain, and sanity comes from sane.