* Formal: The company's new marketing campaign was a complete debacle, resulting in a significant drop in sales.
* Casual: The camping trip turned into a debacle when our tent collapsed in the storm.
* Figurative: My attempt to bake a birthday cake was a total debacle, ending in a burnt and lopsided mess.
* Historical: The Battle of Thermopylae, despite its valiant defense, was ultimately a debacle for the Greeks.
Remember that "debacle" signifies a complete failure or a disastrous event.