Open English Wordnet
Adjectives
(s)labyrinthine, labyrinthian, mazyresembling a labyrinth in form or complexity“a labyrinthine network of tortuous footpaths”
(s)Byzantine, convoluted, involved, knotty, tangled, tortuous, labyrinthinehighly complex or intricate and occasionally devious“the Byzantine tax structure”, “Byzantine methods for holding on to his chairmanship”, “convoluted legal language”, “convoluted reasoning”, “the plot was too involved”, “a knotty problem”, “got his way by labyrinthine maneuvering”, “Oh, what a tangled web we weave” (Sir Walter Scott), “tortuous legal procedures”, “tortuous negotiations lasting for months”