Here are examples of the word/phrase "abstruseness" used in a sentence and paraphrased in a sentence...
There is too much abstruseness within this document to get a good idea of what it is about.
There is too much mysteriousness within this document to get a good idea of what it is about.
I want to understand where you're coming from, but there is too much abstruseness within how you express yourself.
I want to understand where you're coming from, but there is too much crypticness within how you express yourself.
Other Examples...