Undoable

Origin 1

From - + doable.

Full definition of undoable

Adjective

undoable

Not doable; impossible to do.

Origin 2

From undo + -able.

Adjective

undoable

Possible to undo; reversible.

2003, Suzanne Sayegh Thomas, Using QuarkXPress 6.0 (page 87)Many new functions and commands are undoable and a maximum of 30 commands are undoable and redoable.