American English

Definition of folly noun from the Oxford Advanced American Dictionary

     

    folly

     noun
    noun
    NAmE//ˈfɑli//
     
    (pl. follies)
     
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  1. 1[uncountable, countable] a lack of good judgment; the fact of doing something stupid; an activity or idea that shows a lack of judgment synonym stupidity an act of sheer folly Giving up a secure job seems to be the height of folly. folly (to do something) It would be folly to turn the offer down. the follies of youth His idealism had been soured by the varied spectacle of human folly.
  2. 2[countable] a building that has no practical purpose but was built in the past for decoration, often in the garden of a large country house
See the Oxford Advanced Learner's Dictionary entry: folly