Source : Webster's Revised Unabridged Dictionary (1913)

Incapability \In*ca`pa*bil"i*ty\, n.
   1. The quality of being incapable; incapacity. --Suckling.

   2. (Law) Want of legal qualifications, or of legal power; as,
      incapability of holding an office.

Source : WordNet®

incapability
     n 1: lack of potential for development [syn: {incapableness}]
          [ant: {capability}]
     2: the quality of not being capable -- physically or
        intellectually or legally [syn: {incapableness}] [ant: {capability},
         {capability}]