irrevocable

Once you sign this legal contract, your commitment to the investment becomes irrevocable.

(Chinese) 一旦你签署了这份法律合同，你对该项投资的承诺就变得不可撤回了。

The supreme court's decision was irrevocable, meaning there were no further options for appeal.

(Chinese) 最高法院的判决是终审裁定，这意味着没有进一步上诉的机会。