The Collaborative International Dictionary of English v.0.48:

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.
       [1913 Webster]

WordNet (r) 3.0 (2006):

shortcoming
    n 1: a failing or deficiency; "that interpretation is an
         unfortunate defect of our lack of information" [syn:
         defect, shortcoming]

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "shortcoming":
   absence, adulteration, asymmetry, beggary, blemish, bug, catch,
   contrariety, crack, defect, defectibility, defection,
   defectiveness, deficiency, deficit, demerit, deprivation,
   destitution, difference, disequilibrium, disparity, disproportion,
   drawback, drought, erroneousness, failing, failure, fallibility,
   famine, fault, faultiness, faute, flaw, foible, frailty,
   heterogeneity, hole, imbalance, immaturity, impairment,
   imperfection, impoverishment, impurity, inaccuracy, inadequacy,
   inadequateness, incompleteness, inequality, inequity, inexactitude,
   inexactness, infirmity, injustice, insufficiency, irregularity,
   kink, lack, liability, little problem, mediocrity, need,
   nonuniformity, odds, omission, overbalance, patchiness, problem,
   rift, shortage, shortfall, sin, sketchiness, snag,
   something missing, starvation, taint, unbalance, undevelopment,
   unevenness, unfair discrimination, unperfectedness, unsoundness,
   vulnerable place, want, wantage, weak link, weak point, weakness