Lewis Short
(adjective) : frontÅsus, a, um, 2. frons
* Manybrowed, having several foreheads.
* Lit., said of Janus: frontosior,Aug. Civ. D. 1, 4 fin.
* Trop., that has a bold forehead, shameless (late Lat.), Aug. Serm. in Psa. 1, 68.
Charlton T. Lewis, Charles Short, A Latin Dictionary