Related Clues:

• Insanity
• Misguided act
• Extreme foolishness
• See 6 Across
• Absurdity
• Huge mistake
• Tomfoolery
• Utter foolishness
• Silliness
• "Where ignorance is bliss, 'tis --- to be wise"
• Utter madness
• Costly undertaking
• Foolishness
• Seward's purchase, it was said
• Psychopathy, e.g.