unwisdom

Etymology

From Old English unwīsdōm, corresponding to un- +‎ wisdom.

Noun

unwisdom (countable and uncountable, plural unwisdoms)

1. Lack of wisdom; unwise conduct or action [from 9th c.]

   Synonyms: ignorance, stupidity

   • J. A. Froude

     Sumptuary laws are among the exploded fallacies which we have outgrown, and we smile at the unwisdom which could except to regulate private habits and manners by statute.

   • 2010, Christopher Hitchens, Hitch-22, Atlantic 2011, p. 151:

     Reporting from Vietnam in 1945, he may have been the first person to assert the extreme unwisdom of trying to restore French colonialism with British troops.