noun (n)

• an offensive or indecent word or phrase(noun.communication)

  Synonym:
  dirty word, filth, obscenity, smut
  

  source: wordnet30
• the quality of lacking taste and refinement(noun.attribute)

  Synonym:
  coarseness, commonness, grossness, raunch, vulgarity
  

  source: wordnet30
• Grossness; rudeness; vulgarity.(noun)

  source: webster1913