Source : Webster's Revised Unabridged Dictionary (1913)

Incompetence \In*com"pe*tence\, Incompetency \In*com"pe*tency\,
   n. [Cf. F. incomp['e]tence.]
   1. The quality or state of being incompetent; want of
      physical, intellectual, or moral ability; insufficiency;
      inadequacy; as, the incompetency of a child hard labor, or
      of an idiot for intellectual efforts. ``Some inherent
      incompetency.'' --Gladstone.

   2. (Law) Want of competency or legal fitness; incapacity;
      disqualification, as of a person to be heard as a witness,
      or to act as a juror, or of a judge to try a cause.

   Syn: Inability; insufficiency; inadequacy; disqualification;
        incapability; unfitness.

Source : WordNet®

incompetence
     n 1: lack of physical or intellectual ability or qualifications
          [syn: {incompetency}] [ant: {competence}]
     2: inability of a part or organ to function properly