[syn: incapability, incapableness]
The Collaborative International Dictionary of English v.0.48:
Incapableness \In*ca"pa*ble*ness\, n.
   The quality or state of being incapable; incapability.
   [1913 Webster]
WordNet (r) 3.0 (2006):
incapableness
    n 1: lack of potential for development [syn: incapability,
         incapableness] [ant: capability, capableness,
         potentiality]
    2: the quality of not being capable -- physically or
       intellectually or legally [syn: incapability,
       incapableness] [ant: capability, capableness]