adjective

consisting of many interconnecting parts or elements; intricate.

a complicated stereo system

complex,intricate,involved,convoluted,tangled,elaborate,impenetrable,knotty,tricky,thorny,serpentine,labyrinthine,tortuous,cumbersome,Byzantine,Daedalian,Gordian,confused,confusing,bewildering,baffling,puzzling,perplexing,difficult to understand,above one’s head,fiddly,involute,involuted