jungleEnglishOxford American Thesaurusjungle noun 1 the Amazon jungle: tropical forest, (tropical) rainforest; wilderness, wilds, the bush. 2 the jungle of third world bureaucracy: complexity, confusion, complication, mess, chaos; labyrinth, maze, tangle, snarl, web. □ the law of the junglethe survival of the fittest, each/every man for himself, dog-eat-dog.