Source : Webster's Revised Unabridged Dictionary (1913)

Foolery \Fool"er*y\, n.; pl. {Fooleries}.
   1. The practice of folly; the behavior of a fool; absurdity.

            Folly in fools bears not so strong a note, As
            foolery in the wise, when wit doth dote. --Shak.

   2. An act of folly or weakness; a foolish practice; something
      absurd or nonsensical.

            That Pythagoras, Plato, or Orpheus, believed in any
            of these fooleries, it can not be suspected. --Sir
                                                  W. Raleigh.

Source : WordNet®

foolery
     n : foolish or senseless behavior [syn: {folly}, {tomfoolery}, {craziness},
          {lunacy}, {indulgence}]