Definitions for "Abstruse"
Remote from apprehension; difficult to be comprehended or understood; recondite; as, abstruse learning.
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"
adj. Dealing with matters difficult to be understood.
Keywords:  hidden, concealed, way
Concealed or hidden out of the way.