Not to be remedied, corrected, or redressed; incurable; as, an irremediable disease or evil
impossible to remedy or correct or redress; "an irremediable error"; "irremediable defects of character
If a bad situation or change is irremediable, the situation cannot be improved. His memory suffered irremediable damage. = irreparable. so bad that it is impossible to make it better (irremediabilis, from remediare )