Noun
Want of wisdom; unwise conduct or action; folly; simplicity; ignorance.
Source: Webster's dictionary'Tis possible, young sir, that some excess Mars youthful judgment and old men's no less; Yet we must take our counsel as we may For (flying years this lesson still convey), 'Tis worst unwisdom to be overwise, And not to use, but still correct one's eyes. Arthur Hugh Clough