Unwisdom, n.
Want of wisdom; unwise conduct or action; folly; simplicity; ignorance. 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. J. A. Froude.
Shades of meaning
Fernald lists unwisdom only as an antonym, under address.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given