The chief enemy or principal opponent; the main antagonist in a story or conflict.
From Greek 'archi-' (chief) plus 'antagonist' (from 'anti-' against plus 'agon' struggle). This word formed to describe the supreme opposing force, primarily in literary and dramatic contexts.
While archvillain and arch-enemy are common words, 'archantagonist' is so rare that using it makes you sound like you're narrating a Victorian novel—it's delightfully pretentious!
Complete word intelligence in one call. Free tier — 50 lookups/day.