資料來源 : Webster's Revised Unabridged Dictionary (1913)

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.

   2. A foolish act; an inconsiderate or thoughtless procedure;
      weak or light-minded conduct; foolery.

            What folly 'tis to hazard life for ill. --Shak.

   3. Scandalous crime; sin; specifically, as applied to a
      woman, wantonness.

            [Achan] wrought folly in Israel.      --Josh. vii.
                                                  15.

            When lovely woman stoops to folly.    --Goldsmith.

   4. The result of a foolish action or enterprise.

            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.

資料來源 : WordNet®

follies
     n : a revue with elaborate costuming