这篇关于中世纪炼金术的文章过于晦涩难懂，我几乎无法理解。

The article on medieval alchemy was too ___recondite for me to understand.

这篇论文使用了太多晦涩难懂的术语，普通读者很难理解。

The paper used too many ___recondite terms that were hard for average readers to understand.