她引经据典的风格晦涩难懂。 Her allusive style is difficult to follow.
他的信有些部分晦涩难解。 Some parts of his letter are rather obscure.
术语，行话在一个职业、学科或阶层的成员间能被理解的特殊术语，但对一般大众来说却晦涩难懂；专门术语 The special terminology understood among the members of a profession, discipline, or class but obscure to the general population; jargon.
他的诗里用了很多晦涩的文学典故。 Her poetry is full of obscure literary allusions.
他的诗作有很多晦涩难解的地方。 His poems are full of obscurities.