Byzantine

of or relating to the Eastern Orthodox Church or the rites performed in it

• “Byzantine monks”
• “Byzantine rites”

of or relating to or characteristic of the Byzantine Empire or the ancient city of Byzantium

highly involved or intricate

• “the Byzantine tax structure”
• “convoluted legal language”
• “convoluted reasoning”
• “intricate needlework”
• “an intricate labyrinth of refined phraseology”
• “the plot was too involved”
• “a knotty problem”

characterized by elaborate scheming and intrigue; devious

• “Byzantine methods for holding on to his chairmanship”
• “a fine hand for Byzantine deals and cozy arrangements”

a native or inhabitant of Byzantium or of the Byzantine Empire