Lewis Short
(adjective) : nūgālis, e, nugae
* Frivolous, trifling, worthless, empty (post-class.): theoremata,Gell. 1, 2, 6; Mart. Cap. 1, § 2 Kopp (al. nugalas): scholica quaedam,id. 4, 1, 1; 7, 17, 3: illa olim nugalia conscripsi,trifles, bagatelles,Front. de Fer. Als. 3 Mai.
Charlton T. Lewis, Charles Short, A Latin Dictionary