abstruseness
n. C1 Advanced ab·struse·ness
n. the quality of being very difficult to understand or too complicated for most people. It describes ideas or writing that are so obscure they feel like a secret language.
n. the quality of being obscure, difficult to understand, or intentionally vague. Often used to describe complex philosophical or mathematical concepts that lack clarity for the general public.
The professor's lecture was full of abstruseness.
The legal document was so full of abstruseness that even the lawyers struggled to find a clear path forward.
While the author's prose was praised for its poetic beauty, many critics argued that the abstruseness of the metaphors made the central themes nearly impossible to grasp for a modern audience.
From abstruse + -ness.