Source : Webster's Revised Unabridged Dictionary (1913)

Drawback \Draw"back`\, n.
   1. A loss of advantage, or deduction from profit, value,
      success, etc.; a discouragement or hindrance;
      objectionable feature.

            The avarice of Henry VII . . . . must be deemed a
            drawback from the wisdom ascribed to him. --Hallam.

   2. (Com.) Money paid back or remitted; especially, a certain
      amount of duties or customs, sometimes the whole, and
      sometimes only a part, remitted or paid back by the
      government, on the exportation of the commodities on which
      they were levied. --M`Culloch.

Source : WordNet®

drawback
     n : the quality of being a hindrance; "he pointed out all the
         drawbacks to my plan"