not tied or fastened

the top few buttons of his shirt were undone

not done or finished

he had left his homework undone

(of a person) ruined by a disastrous or devastating setback or reverse

I am undone!

unfasten, untie, or loosen (something)

the knot was difficult to undo

cancel or reverse the effects or results of (a previous action or measure)

there wasn't any way Evelyn could undo the damage

cause the downfall or ruin of

Iago's hatred of women undoes him