unwisdom

/ʌnˈwɪzdəm/
noun
  1. Lack of wisdom; foolishness or poor judgment.
    • History books often warn against the unwisdom of ignoring diplomatic solutions.
    • She regretted the unwisdom of spending all her savings on a gamble.
    • The unwisdom of his decision became clear when the project failed.
What does "unwisdom" mean? | whatsthatwordmean | whatsthatwordmean