Lewis Short
(adjective) : ĭn-exstinguĭbĭlis (inext-), e
* Unextinguishable (ante- and post-class.).
* Lit.: flamma,Lact. 7, 19: ignis,Vulg. Matt. 3, 12; ib. Marc. 9, 42.
* Trop.: mala consuetudo, indelible, Varr. ap. Non. 131, 6.
Charlton T. Lewis, Charles Short, A Latin Dictionary