HUBRIS

From Wikipedia:

Hubris or hybris (Greek ὕβριςa) according to its modern usage, is exaggerated self pride, arrogance or self-confidence (overbearing pride), often resulting in fatal retribution. In Ancient Greece, "hubris" referred to actions taken in order to shame and humiliate the victim, thereby making oneself seem superior.

Hubris was a crime in classical Athens. It was considered the greatest sin of the ancient Greek world. The category of acts constituting hubris for the ancient Greeks apparently broadened from the original specific reference to molestation of a corpse, or a humiliation of a defeated foe, to molestation, or irreverent, "outrageous treatment", in general. The meaning was further generalized in its modern English usage to apply to any outrageous act or exhibition of pride or disregard for basic moral law. Such an act may be referred to as an "act of hubris", or the person committing the act may be said to be hubristic. Ate, Greek for 'ruin, folly, delusion', is the action performed by the hero, usually because of his/her hubris, or great pride, that leads to his/her death or downfall.