Learn English – Formal way to say “hard to understand”

formalityphrase-requests

I want to say in a formal and more precise way (academic publication) that since something has been obfuscated, it is really hard to understand.

By "hard to understand" I mean that understanding its internal structure would be complicated by an external person.

However, this formulation is too broad, too spontaneous for what I need to write.
What terms could I use to express this in a formal and concise manner?

Best Answer

I would use the word intricate, meaning:

with many complicated details that make something difficult to understand

or

having a lot of small parts or pieces arranged in a complicated way, and therefore sometimes difficult to understand in detail

both of which may fit your description well.

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