Lewis & Short

ĭn-exstinguĭbĭlis (inext-), e, adj., unextinguishable (ante- and post-class.).

  1. I. Lit.: flamma, Lact. 7, 19: ignis, Vulg. Matt. 3, 12; ib. Marc. 9, 42.
  2. II. Trop.: mala consuetudo, indelible, Varr. ap. Non. 131, 6.