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folly definition

folly (fäl′ē)

noun pl. follies -·lies

  1. a lack of understanding, sense, or rational conduct; foolishness
  2. any foolish action or belief
  3. any foolish and useless but expensive undertaking
    1. Obsolete wickedness or evil; also, lewdness
    2. action that ends or can end in disaster

Etymology: ME folie < OFr < fol: see fool

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