[1] : The Collaborative International Dictionary of English v.0.48

rude \rude\, a. compar. ruder; superl. rudest. f., fr. l.
   rudis.
   1. characterized by roughness; umpolished; raw; lacking
      delicacy or refinement; coarse.
      1913 webster

            such gardening tools as art, yet rude, . . . had
            formed.                               --milton.
      1913 webster

   2. hence, specifically:
      a unformed by taste or skill; not nicely finished; not
          smoothed or polished; -- said especially of material
          things; as, rude workmanship. "rude was the cloth."
          --chaucer.
          1913 webster

                rude and unpolished stones.       --bp.
                                                  stillingfleet.
          1913 webster

                the heaven-born child
                all meanly wrapt in the rude manger lies.
                                                  --milton.
          1913 webster
      b of untaught manners; unpolished; of low rank; uncivil;
          clownish; ignorant; raw; unskillful; -- said of
          persons, or of conduct, skill, and the like. "mine
          ancestors were rude." --chaucer.
          1913 webster

                he was but rude in the profession of arms. --sir
                                                  h. wotton.
          1913 webster

                the rude forefathers of the hamlet sleep.
                                                  --gray.
          1913 webster
      c violent; tumultuous; boisterous; inclement; harsh;
          severe; -- said of the weather, of storms, and the
          like; as, the rude winter.
          1913 webster

                clouds pushed with winds, rude in their shock.
                                                  --milton.
          1913 webster

                the rude agitation of water breaks it into
                foam.                             --boyle.
          1913 webster
      d barbarous; fierce; bloody; impetuous; -- said of war,
          conflict, and the like; as, the rude shock of armies.
      e not finished or complete; inelegant; lacking
          chasteness or elegance; not in good taste;
          unsatisfactory in mode of treatment; -- said of
          literature, language, style, and the like. "the rude
          irish books." --spenser.
          1913 webster

                rude am i in my speech.           --shak.
          1913 webster

                unblemished by my rude translation. --dryden.
          1913 webster

   syn: impertinent; rough; uneven; shapeless; unfashioned;
        rugged; artless; unpolished; uncouth; inelegant; rustic;
        coarse; vulgar; clownish; raw; unskillful; untaught;
        illiterate; ignorant; uncivil; impolite; saucy;
        impudent; insolent; surly; currish; churlish; brutal;
        uncivilized; barbarous; savage; violent; fierce;
        tumultuous; turbulent; impetuous; boisterous; harsh;
        inclement; severe. see impertiment.
        1913 webster -- rude"ly, adv. -- rude"ness, n.
        1913 webster
see also:
ruder rudest impertiment rude"ly rude"ness 

[2] : WordNet (r) 2.0

rudeness
     n 1: a manner that is rude and insulting syn: discourtesy
          ant: courtesy
     2: a wild or unrefined state syn: crudeness, crudity, primitiveness,
         primitivism
see also:
discourtesy courtesy crudeness crudity primitiveness primitivism 

[3] : Moby Thesaurus II by Grady Ward, 1.0

126 moby thesaurus words for "rudeness":
   gothicism, bad manners, bad taste, barbarism, barbarousness,
   bombasticness, brashness, brassiness, brazenfacedness, brazenness,
   cacology, cacophony, caddishness, callowness, cheekiness,
   clumsiness, coarseness, cockiness, contempt, cracked voice,
   crassness, crudeness, crudity, cumbrousness, derision, discord,
   discourteousness, discourtesy, disrespectfulness, dryness,
   dysphemism, earthiness, face of brass, flippancy, freshness,
   gaudiness, gracelessness, greenness, gross behavior, grossness,
   gruffness, gutturalism, gutturality, gutturalness, harshness,
   heaviness, hoarseness, huskiness, ill breeding, ill manners,
   ill-balanced sentences, immatureness, immaturity, impertinence,
   impoliteness, impropriety, impudence, impurity, incivility,
   inconcinnity, inconsiderateness, incorrectness, indecorousness,
   inelegance, inelegancy, infelicity, insensitivity, inurbanity,
   lack of finish, lack of polish, leadenness, loudness, loutishness,
   mannerlessness, meretriciousness, nondevelopment, obscenity,
   offensiveness, oversimplicity, oversimplification, pompousness,
   ponderousness, poor diction, raspiness, raucity, rawness,
   reductionism, ribaldry, ridicule, roughness, scrapiness,
   scratchiness, sesquipedalianism, sesquipedality, simplism,
   slipshod construction, stertorousness, stiltedness, tactlessness,
   tastelessness, the rough, thickness, throatiness, turgidity,
   ugliness, uncourtliness, uncouthness, uncultivation, undevelopment,
   uneuphoniousness, unfinish, unfinishedness, unfledgedness,
   ungallantness, ungentlemanliness, ungracefulness, ungraciousness,
   unmannerliness, unpoliteness, unrefinement, unripeness,
   unseemliness, unsolicitousness, unwieldiness, vulgarism,
   vulgarity

[4] : Bouvier's Law Dictionary, Revised 6th Ed (1856)

rudeness, crim. law. an impolite action; contrary to the usual rules 
observed in society, committed by one person against another. 
     2. this is a relative term which it is difficult to define: those acts 
which one friend might do to another, could not be justified by persons 
altogether unacquainted persons moving in polished society could not be 
permitted to do to each other, what boatmen, hostlers, and such persons 
might perhaps justify. 2 hagg. eccl. r. 73. an act done by a gentleman 
towards a lady might be considered rudeness, which, if done by one gentleman 
to another might not be looked upon in that light. russ.  ry. 130. 
     3. a person who touches another with rudeness is guilty of a battery. 
q.v. 

Rudeness >> R Words
Rudeness, definition of term: Rudeness
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