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byzantine
Although the common historical meaning of 'byzantine' relates to the ancient city of Byzantium, or to the Byzantine Empire; we often use this word to describe a system which is highly complicated, intricate and involved - often with the purpose of keeping out outsiders.
Synonyms:
Byzantine, Rube Goldberg, abstruse, arduous, convoluted, difficult, difficult, elaborate, entangled, gordian, intricate, involved, knotty, labyrinthine, mega factor, mind blower, perplexing, problematic, puzzling, rat's nest, recondite, snake pit, sophisticated