The Collaborative International Dictionary of English v.0.48:

Ignobility \Ig`no*bil"i*ty\, n. [L. ignobilitas: cf. F.
   ignobilit['e].]
   Ignobleness. [Obs.] --Bale.
   [1913 Webster]

WordNet (r) 3.0 (2006):

ignobility
    n 1: the quality of being ignoble [syn: ignobleness,
         ignobility]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "ignobility":
   abominability, baseness, beastliness, commonness, commonplaceness,
   contemptibility, contrariety, crudeness, degradation, demotion,
   depluming, despicability, despicableness, disgustingness,
   displuming, foulness, fulsomeness, grossness, harshness,
   hatefulness, heinousness, homeliness, ignominiousness, ignominy,
   infamousness, infamy, ingloriousness, loathsomeness, loss of honor,
   lowness, meanness, nastiness, nauseousness, noisomeness,
   noxiousness, objectionability, objectionableness, obloquy,
   obnoxiousness, obscenity, odiousness, odium, offensiveness,
   opprobrium, ordinariness, plebeianism, putridity, putridness,
   rebarbativeness, repellence, repellency, repugnance, repulsiveness,
   rottenness, unspeakableness, vileness