[syn: unsuitability, unsuitableness, ineptness]
The Collaborative International Dictionary of English v.0.48:
Ineptness \In*ept"ness\, n.
   Unfitness; ineptitude.
   [1913 Webster]
         The feebleness and miserable ineptness of infancy.
                                                  --Dr. H. More.
   [1913 Webster]
WordNet (r) 3.0 (2006):
ineptness
    n 1: unskillfulness resulting from a lack of training [syn:
         awkwardness, clumsiness, ineptness, ineptitude,
         maladroitness, slowness]
    2: the quality of having the wrong properties for a specific
       purpose [syn: unsuitability, unsuitableness, ineptness]
       [ant: suitability, suitableness]