noun (n)

• a message that seems to convey no meaning(noun.communication)

  Synonym:
  bunk, hokum, nonsense, nonsensicality
  

  source: wordnet30
• the quality of having no value or significance(noun.attribute)

  Example:
  He resented the meaninglessness of the tasks they assigned him.
  

  Antonym:
  meaningfulness
  

  source: wordnet30