Archenemy (noun)

A long-standing and implacable enemy, often considered to be the principal adversary or opposing force.

Origin:

The word 'archenemy' is a combination of the words 'arch-' (meaning 'chief or principal') and 'enemy', which dates back to the mid-19th century. it was originally used to describe a principal or chief enemy, but has since come to mean a long-standing, implacable enemy.

Examples:

1. Batman and the Joker have been each other's archenemies for decades, locked in a never-ending struggle for power and control.
2. Superman's archenemy, Lex Luthor, has been a constant thorn in his side, using his vast intellect and resources to try to defeat the Man of Steel.
3. In the world of politics, rival political parties can often be seen as each other's archenemies, locked in a struggle for power and influence.
4. In many classic fairy tales, the protagonist's archenemy is often an evil witch or sorcerer, who is intent on causing harm or mischief.
5. The two teams have a long-standing rivalry and are each other's archenemies, with the outcome of their games always eagerly anticipated by fans.