A supreme or chief deceiver; someone who is the greatest or most skilled at deception.
From 'arch-' (chief, principal) combined with 'deceiver.' This is a literary or rhetorical coinage from 16th-century English, often applied metaphorically to Satan or villainous characters.
Medieval and Renaissance writers loved using 'arch-' compounds as insults or to describe the devil—calling someone an 'archdeceiver' was basically saying they were the master of all lies, which is pretty dramatic!
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