recondite
/ˈrekəndaɪt/Recondite areas of knowledge or learning are difficult to understand, and not many people know about them. 深奥的
adjective [原级] 深奥的;隐藏的
Her poems are modishly experimental in style and recondite in subject matter. 她的诗在风格上时尚朦胧,在主题上深奥难懂。