[syn: reconditeness, abstruseness, abstrusity, profoundness, profundity]
The Collaborative International Dictionary of English v.0.48:
Abstruseness \Ab*struse"ness\, n.
   The quality of being abstruse; difficulty of apprehension.
   --Boyle.
   [1913 Webster]
WordNet (r) 3.0 (2006):
abstruseness
    n 1: the quality of being unclear or abstruse and hard to
         understand [syn: obscureness, obscurity,
         abstruseness, reconditeness] [ant: clarity,
         clearness, limpidity, lucidity, lucidness,
         pellucidity]
    2: wisdom that is recondite and abstruse and profound; "the
       anthropologist was impressed by the reconditeness of the
       native proverbs" [syn: reconditeness, abstruseness,
       abstrusity, profoundness, profundity]