UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈfɒli/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈfɑli/ ,USA pronunciation: respelling(folē)

Inflections of 'folly' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": follies

WordReference Random House Learner's Dictionary of American English © 2020
fol•ly /ˈfɑli/USA pronunciation   n., pl.  -lies. 
  1. the state or quality of being foolish:[uncountable]to travel without money would be folly.
  2. [countable] a foolish action, practice, idea, etc.
  3. Show Businessfollies, [plural] a theatrical revue.

WordReference Random House Unabridged Dictionary of American English © 2020
fol•ly  (folē),USA pronunciation n., pl.  -lies  for 2–6.
  1. the state or quality of being foolish;
    lack of understanding or sense.
  2. a foolish action, practice, idea, etc.;
    absurdity:the folly of performing without a rehearsal.
  3. a costly and foolish undertaking;
    unwise investment or expenditure.
  4. Architecturea whimsical or extravagant structure built to serve as a conversation piece, lend interest to a view, commemorate a person or event, etc.: found esp. in England in the 18th century.
  5. Show Businessfollies, a theatrical revue.
  6. [Obs.]wickedness;
  • Old French, derivative of fol, fou foolish, mad. See fool1
  • Middle English folie 1175–1225
    • 2.See corresponding entry in Unabridged imprudence, rashness, mistake, foolishness, indiscretion, injudiciousness;
      madness, lunacy.

Collins Concise English Dictionary © HarperCollins Publishers::
folly /ˈfɒlɪ/ n ( pl -lies)
  1. the state or quality of being foolish; stupidity; rashness
  2. a foolish action, mistake, idea, etc
  3. a building in the form of a castle, temple, etc, built to satisfy a fancy or conceit, often of an eccentric kind
  4. (plural) an elaborately costumed revue
Etymology: 13th Century: from Old French folie madness, from fou mad; see fool1
'folly' also found in these entries:

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