noun

• (countable) Something that is obscene.
  "Martha wouldn't go into the art museum because, as she put it, "They have obscenities just sitting out, on display!""
• (countable) An act of obscene behaviour.
  "Bestiality was outlawed as an obscenity in the strongly conservative community."
• (countable) Specifically, an offensive word; a profanity; a dirty word.
  "Eliza couldn't stand her daughter's music; as she saw it, it was just shouted obscenities and a heavy drum beat."
• (uncountable) Lewdness, indecency, or offensive behaviour or material.
  "The coalition of religious conservatives was campaigning against, in their view, rampant obscenity in the entertainment industry."