Lewis Short
(adj.adv.) : industrĭōsus, a, um, adj.industria
* Very active, diligent, or industrious (postAug.), Cassiod. Var. 8, 33; Sen. Prov. 2 dub.; Val. Max. 3, 4, 2 dub.—Hence, adv.: industrĭōsē, very industriously, Cassiod. Var. 5, 1; Suet. Vit. Juv.— Comp., Fronto ad M. Caes. 4, 3 med.— Sup., Cato ap. Charis. p. 181 P.
Charlton T. Lewis, Charles Short, A Latin Dictionary