Source : Webster's Revised Unabridged Dictionary (1913)

Shortcoming \Short"com`ing\, n.
   The act of falling, or coming short; as:
   (a) The failure of a crop, or the like.
   (b) Neglect of, or failure in, performance of duty.

Source : WordNet®

shortcoming
     n : a failing or deficiency; "that interpretation is an
         unfortunate defect of our lack of information" [syn: {defect}]