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Webster 1913 Edition

Adj.

Not repealable; not capable of being repealed or revoked, as a law.

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Irˊre-peal′a-ble-ness

Noun.

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Irˊre-peal′a-bly

adv.

Adj.

[in and repealable. See Repeal.]

That cannot be legally repealed or annulled.

irrepealable ‎(comparative more irrepealable, superlative most irrepealable)

That cannot be repealed.
- 1836, American Anti-Slavery Society, The Anti-Slavery Examiner, Part 1 of 4:
  Is the impious edict irrepealable?
- 1911, Frederic Jesup Stimson, Popular Law-making:
  It was anticipated in the writer's work on constitutional law ("Federal and State Constitutions," p. 186, note 8): "The enabling acts admitting the eight new Western States usually provided against polygamy on account of the Mormon influence, and this, with other provisions concerning schools, etc., was made forever irrepealable without the consent of the United States; see Utah 3, 1.