The Collaborative International Dictionary
Irrepealable
Irrepealable \Ir`re*peal"a*ble\, a. Not repealable; not capable of being repealed or revoked, as a law. -- Ir`re*peal"a*ble*ness, n. -- Ir`re*peal"a*bly, adv.
Wiktionary
irrepealable
a. That cannot be repealed.