What is Ex Dolo Malo?

Legal Definition
Out of fraud or deceit. When a cause of action arises from fraud or deceit, it cannot be supported: Ex dolo malo, non oritur actio.
-- Bouviers Law Dictionary
Legal Definition
Out of fraud; out of deceitful or tortious conduct. A phrase applied to obligations and causes of action vitiated by fraud or deceit
-- Black's Law Dictionary
Legal Definition
From evil intent.
-- Ballentine's Law Dictionary