...It was not a matter of argument,certainly not on abstruse points... 
Major Gambier-Parry 「'Murphy'」
...I had heard the name; and the syllables represented to my poor brain the whole whirling legion of the abstruse...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
...In order to excelVasari, it seems he chose an abstruse mode of writing, in opposition tothe plain style of that author...
Luigi Antonio Lanzi Thomas Roscoe 「The History of Painting in Italy, Vol. 2 (of 6)」
...There never has been a seemingly more abstruse subject for the human mind to grasp than the theories involving a true conception of space-time...
Raymond King Cummings 「The White Invaders」
...Yet, doubtless, to those of Tako’s realm, inheriting, let me say, the consciousness of its reality, there was nothing abstruse about it...
Raymond King Cummings 「The White Invaders」
...The abstruse nature of the study, my inexperience and wantof means dispirited me...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...Noperceptible diminution of solar heat having taken place within historicexperience, so far as can be ascertained, we are driven to seek somemore abstruse explanation...
Cecil G. Dolmage 「Astronomy of To-day」
... Atheism, then, as well as philosophy, like all profound abstruse sciences, is not calculated for the vulgar; neither is it suitable to the great mass of mankind...
Paul Henri Thiery (Baron D'Holbach) Samuel Wilkinson 「The System of Nature, Volume 2」
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