Definition - What does Extreme Cruelty mean?
Extreme cruelty refers to the ground for divorce which is based upon mental and physical harm inflicted by one spouse to another. This usually supports the divorce judgment and in some cases also support the unequal property division.
Justipedia explains Extreme Cruelty
Today, all states except South Dakota and Illinois recognize "no fault" divorce. However, in some places cruelty evidence may result in judgments favoring the party that has been the victim of cruelty.