Lewis Short
(adj.adv.) : infrūnītus, a, um, adj.2. in-fruniscor
* Unfit for enjoyment, tasteless, senseless, silly (post-Aug.): animus,Sen. Vit. Beat. 13, 23: mulier,id. Ben. 3, 16: copia,Macr. S. 5, 1 med.; Vulg. Eccli. 31, 23, and 23, 6.— Hence, adv.: infrūnītē, senselessly (late Lat.), Hilar. in Job, 3, p. 220.
Charlton T. Lewis, Charles Short, A Latin Dictionary