- hard to understand; recondite; esoteri
- Obsolete. secret; hidden.
c.1600, from L. abstrusus, pp. of abstrudere "conceal," lit. "to thrust away," from ab- "away" + trudere "to thrust, push" (see extrusion). (http://dictionary.reference.com/browse/abstruse)
"Hippocrates had once abstrusely opined that cancer was 'best left untreated, since patients live longer that way.'"
- Siddhartha Mukherjee, The Emperor of All Maladies: a Biography of Cancer