abstruse

Adjective

WordNet 3.0

difficult to penetrate; incomprehensible to one of ordinary understanding or knowledge“the professor's lectures were so abstruse that students tended to avoid them”“a deep metaphysical theory”“some recondite problem in historiography”Synonyms: deep recondite

Abstruse \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.] [1913 Webster]

The eternal eye whose sight discerns Abstrusest thoughts.— Milton.[1913 Webster]

2.Remote from apprehension; difficult to be comprehended or understood; recondite; as, abstruse learning. [1913 Webster]

Profound and abstruse topics.— Milman.[1913 Webster]