abstruse Meaning, Definition & Usage

  1. adjective satellite difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge
    recondite; deep.
    • the professor's lectures were so abstruse that students tended to avoid them
    • a deep metaphysical theory
    • some recondite problem in historiography

WordNet

Ab*struse" adjective
Etymology
L. abstrusus, p. p. of abstrudere to thrust away, conceal; ab, abs + trudere to thrust; cf. F. abstrus. See Threat.
Definitions
  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.

Webster 1913