hubris
//ˈhjuːbrɪs//
Noun
1
Excessive pride, arrogance, or self-confidence, especially when it leads to one's downfall.
His hubris led him to believe he could never fail, but eventually it caused his downfall.
2
In Greek tragedy, an act of defiance against the gods or moral order, typically resulting in divine punishment or nemesis.
The king's hubris in challenging the gods led to his tragic downfall.