noun (n)

• the quality of being unclear or abstruse and hard to understand(noun.attribute)

  Synonym:
  obscureness, obscurity, reconditeness
  Antonym:
  clarity, clearness, limpidity, lucidity, lucidness, pellucidity
  

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

  Synonym:
  abstrusity, profoundness, profundity, reconditeness
  

  source: wordnet30
• The quality of being abstruse; difficulty of apprehension.(noun)

  source: webster1913