Lewis Short
(adj.adv.) : confrăgus, a, um, adj.confringo (post-Aug.; poet. for confragosus)
* Rough, rugged, uneven: dumeta densis arboribus,Luc. 6, 126; Val. Fl. 3, 581.—Subst.: con-frăga, ōrum, n., a rough place, thicket: silvae,Stat. Th. 4, 494.—Comp., sup., and adv. not in use.
Charlton T. Lewis, Charles Short, A Latin Dictionary