Jungle

1. A large, undeveloped, humid forest, especially in a tropical region, that is home to many wild plants and animals. Many wild beasts roam in the jungle.
2. A place where people behave ruthlessly, unconstrained by law or morality. It is a jungle out there in that part of the city.
3. Something made up of many confused elements; a bewildering complex or maze, They had to sort through a jungle of city regulations.