unundoable

Not undoable; unable to be undone.

Adjective

  1. Not undoable; unable to be undone.
    • Dots appeared, but before they could become a message, Roxy cut and pasted the link to the blog post into the chat window and let it fly with unundoable consequence. - 2022, Carter Bays, The Mutual Friend:

    Synonyms: irreversible

Origin

From un- + undoable.