abstruse

Ordinary people may fear there is some abstruse science about this.

This abstruse notion is the foundation of the Hegelian logic.

With scholars and philosophers they held their own in abstruse and abstract discussions.

And she, following, applied herself to the most abstruse of Art-studies.

An abstruse, ancient classic, usually called the Book of Changes.

"It is full early in the morning for the cryptic and abstruse," I said.

The arguments should not be abstruse but clear and striking.

Mother's mind seemed to be working at some abstruse calculation.

Apparently he had been led into the most abstruse mathematical regions.

But he was not in the habit of troubling himself with abstruse problems.