abstruse

US /æbˈstruːs/
UK /æbˈstruːs/
"abstruse" picture
1.

深奥的, 难懂的, 晦涩的

difficult to understand; obscure

:
The philosopher's writings were too abstruse for the average reader.
这位哲学家的著作对于普通读者来说过于深奥
He often uses abstruse terminology that only experts can grasp.
他经常使用只有专家才能理解的深奥术语。