GNU Collaborative International Dictionary of English

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1.       
   Abstruse , a. [L. abstrusus, p. p. of abstrudere to thrust away, conceal; ab, abs + trudere to thrust; cf. F. abstrus. See Threat.]
    Concealed or hidden out of the way. [Obs.]
   1913 Webster
   The eternal eye whose sight discerns
   Abstrusest thoughts.
   Milton.
   
   1913 Webster
   Remote from apprehension; difficult to be comprehended or understood; recondite; as, abstruse learning.
   1913 Webster
   Profound and abstruse topics.
   Milman.
   
   1913 Webster