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Synonyms for Byzantine (same or very similar meaning)

WordNet sense 1 (highly complex or intricate):
convoluted, involved, knotty, tangled, tortuous

WordNet sense 2 (complicated in structure; consisting of interconnected parts):
complex, complex

WordNet sense 3 (marked by skill in achieving a desired end especially with cunning or craft):

From the ODE community, based on WordNetadd/edit