Irrevocable means impossible to undo or take back. An irrevocable decision, an irrevocable trust, irrevocable damage.
In law it is a term of art rather than a flourish: an irrevocable letter of credit or an irrevocable trust genuinely cannot be cancelled by the person who made it. The stress falls on the second syllable.
1adjectiveirrevocableImpossible to undo or take back.
“Once you sign the papers, the decision is irrevocable.”
irrevocable is a quality.
Latin irrevocabilis is ir-, not, plus revocare, to call back, from re- plus vocare, to call.
Latin
irrevocabilis
Middle French
irrévocable
English, today
irrevocable
From Middle French irrévocable, from Latin irrevocabilis; equivalent to ir- + revoke + -able.
Etymology from Wiktionary, CC BY-SA