adj.不能挽回的；不能取消的；不能變更的

The doom which I have passed upon her is irrevocable. 我對她下的判決是不能挽回的。

We ask you to use an irrevocable letter of credit. 我們要求您們開一張不可撤銷的信用狀。

The decision has been made and is irrevocable. 木已成舟已作出決定，無法反悔

His life was set on an irrevocable course. 他的生活道路不可改變。