abstrusities
n. C1 Advanced ab·strusi·ties
n. things that are very difficult to understand or seem strange. You use this word when talking about complex ideas or rules that are hard to follow.
n. difficulties or complexities that are obscure or hard to grasp. Often refers to the intricate details of a subject or the obscure nature of a legal or philosophical argument.
The legal abstrusities of the contract confused everyone.
The professor spent the entire lecture explaining the abstrusities of the ancient text to the students.
Despite the abstrusities of the technical manual, the engineers managed to assemble the prototype within the required timeframe.