undoable

/AH0 N D UW1 AH0 B AH0 L/
noun
  1. 1

    Something that cannot be done; an impossible or impractical task.

adjective
  1. 1

    Not doable; impossible to do.

adjective
  1. 1

    Possible to undo; reversible.

Source: https://en.wiktionary.org/wiki/undoable