Noun folly has 4 senses
  1. folly, foolishness, unwiseness - the trait of acting stupidly or rashly
    --1 is a kind of trait
    Antonyms: wisdom, wiseness
    --1 has particulars:
     indiscretion, injudiciousness; absurdity, fatuity, fatuousness, silliness
  2. stupidity, betise, folly, foolishness, imbecility - a stupid mistake
    --2 is a kind of mistake, error, fault
  3. folly, foolishness, craziness - the quality of being rash and foolish
    --3 is a kind of stupidity
  4. folly, foolery, tomfoolery, craziness, lunacy, indulgence - foolish or senseless behavior
    --4 is a kind of play, frolic, romp, gambol, caper
    --4 has particulars:
     meshugaas, mishegaas, mishegoss; buffoonery, clowning, frivolity, harlequinade, prank