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