a. | 1. | Incapable of being reversed or turned about or back; incapable of being made to run backward; |
2. | Incapable of being reversed, recalled, repealed, or annulled; |
Adj. | 1. | irreversible - impossible to reverse or be reversed; "irreversible momentum toward revolution" Antonyms: reversible - capable of reversing or being reversed; "reversible hypertension" |
2. | irreversible - impossible to reverse or undo; "an irreversible decree" |