Source : Webster's Revised Unabridged Dictionary (1913)

Inadequacy \In*ad"e*qua*cy\, n. [From {Inadequate}.]
   The quality or state of being inadequate or insufficient;
   defectiveness; insufficiency; inadequateness.

         The inadequacy and consequent inefficacy of the alleged
         causes.                                  --Dr. T.
                                                  Dwight.

Source : WordNet®

inadequacy
     n 1: lack of an adequate quantity or number; "the inadequacy of
          unemployment benefits" [syn: {insufficiency}, {deficiency}]
          [ant: {sufficiency}, {sufficiency}]
     2: a lack of competence; "pointed out the insufficiencies in my
        report"; "juvenile offenses often reflect an inadequacy in
        the parents" [syn: {insufficiency}]
     3: unsatisfactoriness by virtue of being inadequate [syn: {inadequateness}]
        [ant: {adequacy}]