Source : Webster's Revised Unabridged Dictionary (1913)

Wishy-washy \Wish"y-wash`y\, a. [See {Wash}.]
   Thin and pale; weak; without strength or substance; --
   originally said of liquids. Fig., weak-minded; spiritless.

         A weak wishy-washy man who had hardly any mind of his
         own.                                     --A. Trollope.

Wishy-washy \Wish"y-wash`y\, n.
   A weak or thin drink or liquor; wish-wash.

Source : WordNet®

wishy-washy
     adj : weak in willpower [syn: {namby-pamby}, {spineless}]