If a decision, action, or change is irrevocable, it cannot be changed or reversed.
例句
It may well be worth waiting for better times before making any irrevocable commitment...最好等到更合适的时候再作出不能反悔的承诺。He said the decision was irrevocable.他说这项决定是不可改变的。
英汉词典释义
adj.
不可改变的, 不可反转的
His life was set on an irrevocable course.他的生活道路不可改变。