abstruse

adj

1. difficult to penetrate
incomprehensible to one of ordinary understanding or knowledge

e.g. the professor's lectures were so abstruse that students tended to avoid them
a deep metaphysical theory
some recondite problem in historiography

Synonym: deeprecondite

1. （尤指故作）深奥的，难解的
You can describe something as abstruse if you find it difficult to understand, especially when you think it could be explained more simply.

e.g. ...fruitless discussions about abstruse resolutions.
对于令人费解的决议案毫无成果的讨论

1. 难解,深奥的：abstract 抽出,提炼,摘录 | abstruse 难解,深奥的 | absurd 荒谬的

2. 深奥的：13.lasting artistic works 永恒的艺术作品 | 14.abstruse 深奥的 | 15.break with old customs 抛弃传统

3. 奥妙的, 深奥的：taphrogeny 地震[地裂]运动 | abstruse 奥妙的, 深奥的 | carthaginian apple 石榴

4. 奥妙的：abstractly 抽象地 | abstruse 奥妙的 | abstrusely 难解地