Why was the Ottoman Empire called "The sick man of Europe"?

The ENTIRE History of the OTTOMAN EMPIRE - The SICK MAN of Europe that REFUSED to Die for 200 Years

The sick man of Europe - History of the Ottoman Empire (1800 - 1900)

Trying to Heal the Sick Man of Europe but I'm Not a Good Doctor - Victoria 3

The Fall of the Ottoman Empire - The Sick Man of Europe

The Sick Man of Europe - The Long Decline of Ottoman Empire

20: The Sick Man of Europe: Twilight of the Ottoman Empire