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| fol·ly [ fóllee ] (plural fol·lies) |
noun |
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| Definition: |
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1. unreason: thoughtlessness, recklessness, or thoughtless or reckless behavior
 She realized, too late, the folly of her course of action.
 It would be folly to continue.
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2. irrational thing: a thoughtless or reckless act or idea
(
often used in the plural
)
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3. architecture eccentric building: a building of eccentric or overelaborate design, usually built for decorative rather than practical purposes
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4. U.S. misguided undertaking: an undertaking that is excessively costly or extravagant, especially one that leads to financial loss or ruin
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| [13th century. < Old French folie< fol "foolish" (see fool)] |