vul·gar·i·ty /ˌvʌlˈgærəti/
  粗俗,粗鄙,粗話
  Vul·gar·i·ty n.
  1. The quality or state of being vulgar; mean condition of life; the state of the lower classes of society.
  2. Grossness or clownishness of manners of language; absence of refinement; coarseness.
     The reprobate vulgarity of the frequenters of Bartholomew Fair.   --B. Jonson.
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  vulgarity
       n : the quality of lacking taste and refinement [syn: coarseness,
            commonness, grossness, vulgarism, raunch]