irrevocable

If you have to ask whether Star Trek is like Star Wars, you are horribly, irrevocably misguided.

We both made a bitter mistake; but now it is over, and irrevocably so.

Down to Ferry Hill's twenty-five yards swept the line of battle, slowly, irrevocably.

All that I was conscious of was the fact that Lucy was gone, irrevocably, as I feared.

And that object for years, was irrevocably, to care for the sick and bury the dead.

A closer inspection of the ruins, revealing beauties not yet departed, leads to an apprehension of what has been irrevocably lost.