Lewis Short
(adjective) : in-vincĭbĭlis, e
* Invincible, unconquerable (post-class.): invincibile et insuperabile malum,Tert. adv. Herm. 11.
* Irrefutable: gravia et invincibilia dicere,App. Mag. p. 297.—Adv.: invin-cĭbĭlĭter, irrefutably, App. Flor. p. 360, 31.
Charlton T. Lewis, Charles Short, A Latin Dictionary