'Folly' definitions:

Definition of 'folly'

(from WordNet)
noun
The trait of acting stupidly or rashly [syn: folly, foolishness, unwiseness] [ant: wisdom, wiseness]
noun
A stupid mistake [syn: stupidity, betise, folly, foolishness, imbecility]
noun
The quality of being rash and foolish; "trying to drive through a blizzard is the height of folly"; "adjusting to an insane society is total foolishness" [syn: folly, foolishness, craziness, madness]
noun
Foolish or senseless behavior [syn: folly, foolery, tomfoolery, craziness, lunacy, indulgence]

Definition of 'Folly'

From: GCIDE
  • Folly \Fol"ly\, n.; pl. Follies. [OE. folie, foli, F. folie, fr. fol, fou, foolish, mad. See Fool.]
  • 1. The state of being foolish; want of good sense; levity, weakness, or derangement of mind. [1913 Webster]
  • 2. A foolish act; an inconsiderate or thoughtless procedure; weak or light-minded conduct; foolery. [1913 Webster]
  • What folly 'tis to hazard life for ill. --Shak. [1913 Webster]
  • 3. Scandalous crime; sin; specifically, as applied to a woman, wantonness. [1913 Webster]
  • [Achan] wrought folly in Israel. --Josh. vii. 15. [1913 Webster]
  • When lovely woman stoops to folly. --Goldsmith. [1913 Webster]
  • 4. The result of a foolish action or enterprise. [1913 Webster]
  • It is called this man's or that man's "folly," and name of the foolish builder is thus kept alive for long after years. --Trench. [1913 Webster]

Synonyms of 'folly'

From: Moby Thesaurus