Definition of "archnemesis" []

• A chief nemesis. (noun)

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• "In the special, Snow Miser controlled cold weather all over Earth; his archnemesis is his step brother, Heat Miser."
• "Stephanie was married to him for about fifteen minutes before she caught him cheating on her with her archnemesis, Joyce Barnhardt."
• "The bad: Her new boss turns out to be someone close to archnemesis Holly Megalyn Echikunwoke, who enlists Naomi to plan Holly's birthday bash — where the "Tonight is the Night" singer will be performing."