heavy, particularly applied to bread, as contrary to light. N.
(·superl) Sated; satisfied; weary; tired. II. Sad (·superl) Heavy; weighty; ponderous; close; hard....
Webster's Dictionary of the English Language
A wicked debauched fellow; one of the ancient family of the sad dogs. Swift translates it into Latin...
Dictionary of The Vulgar Tongue by Francis Grose