The Collaborative International Dictionary of English v.0.48:

Blatancy \Bla"tan*cy\, n.
   Blatant quality.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blatancy
    n 1: the property of being both obvious and offensive; "the
         blatancy of his attempt to whitewash the crime was
         unforgivable"

Moby Thesaurus II by Grady Ward, 1.0:

51 Moby Thesaurus words for "blatancy":
   arrantness, boldness, brazenness, clamorousness, colorfulness,
   conspicuousness, crudeness, dash, dazzle, dazzlingness,
   extravagance, extravaganza, extravagation, flagrance, flagrancy,
   flamboyance, flashiness, gaiety, garishness, gaudery, gaudiness,
   glare, glitter, gorgeousness, high relief, jauntiness, jazziness,
   loudness, luridness, meretriciousness, noisiness, noticeability,
   notoriety, notoriousness, obtrusiveness, ostentation,
   outstandingness, panache, prominence, pronouncedness, salience,
   saliency, sensationalism, shamelessness, showiness, sportiness,
   strikingness, strong relief, tawdriness, vociferousness,
   vulgarness