recondite 
January 22, 2006 | 13:36

Dictionary.com/recondite (etymology):

recondite (REK-uhn-dyt) adjective

  1. Not easily understood; abstruse. See Synonyms at ambiguous.
  2. Concerned with or treating something abstruse or obscure: recondite scholarship.
  3. Concealed; hidden.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition
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