1.
If you describe a place as ~, you mean that it is like a labyrinth. (FORMAL)
The streets of the Old City are narrow and ~.
ADJ: usu ADJ n
2.
If you describe a situation, process, or field of knowledge as ~, you mean that it is very complicated and difficult to understand. (FORMAL)
...his failure to understand the ~ complexities of the situation.
ADJ: usu ADJ n