noun (n)

• extremeness of degree(noun.state)

  Example:
  The profoundness of his ignorance.
  

  source: wordnet30
• wisdom that is recondite and abstruse and profound(noun.cognition)

  Synonym:
  abstruseness, abstrusity, profundity, reconditeness
  

  source: wordnet30
• the intellectual ability to penetrate deeply into ideas(noun.cognition)

  Synonym:
  astuteness, deepness, depth, profundity
  

  source: wordnet30
• the quality of being physically deep(noun.attribute)

  Synonym:
  deepness, profundity
  Antonym:
  shallowness
  

  source: wordnet30
• intellectual depth; penetrating knowledge; keen insight; etc(noun.attribute)

  Example:
  The profoundness of the silence.
  

  Synonym:
  profundity
  Antonym:
  shallowness, superficiality
  

  source: wordnet30
• The quality or state of being profound; profundity; depth.(noun)

  source: webster1913