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From The Collaborative International Dictionary of English v.0.48:
Unwisdom \Un*wis"dom\, n. Want of wisdom; unwise conduct or action; folly; simplicity; ignorance. [1913 Webster] 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. [1913 Webster]