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ir·rev·o·ca·ble

irrevocable

pronunciation:
ih re v k bl
part of speech: adjective
definition: impossible to take back, undo, or cancel.
She'd said those terrible things, and no matter how much she regretted them, they were irrevocable.
antonyms:
revocable
derivations: irrevocably (adv.), irrevocability (n.)