- (rare) Of abstruse quality. [First attested in the mid 17th century.]
1996, Alexander Durig, Autism and Crisis of Meaning:
- ...and I have given the reader such a dose of mathematics, psychology, and all that is abstrusive, that I fear that he may already have left me,...
- ^ “abstrusive” in Lesley Brown, editor-in-chief; William R. Trumble and Angus Stevenson, editors, The Shorter Oxford English Dictionary on Historical Principles, 5th edition, Oxford; New York, N.Y.: Oxford University Press, 2002, ISBN 978-0-19-860457-0, page 10.