"Trivial, trifling; of no significance or importance", Mid 17th cent.; earliest use found in John Gaule (1603/4–1687), Church of England clergyman and author. From classical Latin nūgāci-, nūgāx trifling, frivolous (from nūgārī to trifle + -āx: see -acious) + -ous.[nugacious etymology, nugacious origin, 英语词源]