unwisdom

noun3

1. •
   Lack of wisdom; unwise action or conduct; folly, foolishness.

   • Eccle[siasticus] 21. 15. […] Forsooth vnvvisedome is, &c. [i.e., which is plenteous in euill.] Sixtus [Pope Sixtus V] and the Louans, reading it amisse. — 1612
2. •
   An instance of a lack of wisdom; a foolish act.

   • For hereby are fostered, fed into gigantic bulk, all manner of Unwisdoms, poison-fruits; till, as we way, the life-tree everywhere is made a upas-tree, deadly Unwisdom overshadowing all things; […] — 1843
3. •
   (rare) A foolish or unwise being or force.

   • [W]hat great thing ever happened in this world, a world understood always to be made and governed by a Providence and Wisdom, not by an Unwisdom, without meaning somewhat? — 1839