Ab*struse" (#), 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.
The eternal eye whose sight discerns
Remote from apprehension; difficult to be comprehended or understood; recondite; as, abstruse learning.
Profound and abstruse topics.
© Webster 1913.