The Collaborative International Dictionary of English v.0.48:

Impolite \Im`po*lite"\, a. [L. impolitus unpolishied, pref. im-
   not + politus, p. p. of polire to polish, refine. See
   Polite.]
   Not polite; not of polished manners; wanting in good manners;
   discourteous; uncivil; rude. -- Im`po*lite"ly, adv. --
   Im`po*lite"ness, n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

impoliteness
    n 1: a discourteous manner that ignores accepted social usage
         [ant: niceness, politeness]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "impoliteness":
   bad manners, caddishness, coarseness, crudeness, discourteousness,
   discourtesy, gross behavior, grossness, ill breeding, ill manners,
   incivility, inconsiderateness, insensitivity, inurbanity,
   loutishness, mannerlessness, offensiveness, rudeness, tactlessness,
   uncourtliness, ungallantness, ungentlemanliness, ungraciousness,
   unmannerliness, unpoliteness, unsolicitousness, vulgarity