Nor had Kant the excuse of a subject too abstruse for clear presentation.

Poetry ought to be read slowly and carefully, and the reader ought to pay his author the compliment of crediting him with ideas as important and, on occasion, as abstruse as any in a work of philosophy or abstract science.

The Stone of Foundation constitutes one of the most important and abstruse of all the symbols of Freemasonry.

The explanation of this method may be a little more abstruse than the explanations already given, but it is very simple and elegant when you see it, and I fancy I can make it quite clear.