Definition of Ex nudo pacto non oritur [nascitur] actio
Out of a nude or naked pact [that is, a bare parol agreement without consideration] no action arises. Out of a promise neither attended with particular solemnity (such as belongs to a specialty) nor with any consideration no legal liability can arise. A parol agreement, without a valid consideration, cannot be made the foundation of an action. A leading maxim both of the civil and common law.
That's the definition of Ex nudo pacto non oritur [nascitur] actioin Black's Law Dictionary 6th Edition. Courtesy of Cekhukum.com.