Lewis Short
(adj.adv.) : irrĕtractābĭlis (inr-), e, adj. 2. inretracto
* Irrevocable: sententia,Aug. Conf. 10, 33. — Hence, adv.: irrĕtractābĭlĭ-ter, irrevocably: custodire decreta, Facund. Def. 12, 3.
Charlton T. Lewis, Charles Short, A Latin Dictionary