un ‧ done /ˌʌnˈdʌn◂/ BrE AmE adjective [not before noun]
[ Word Family: verb : ↑ do , ↑ outdo , ↑ overdo , ↑ redo , ↑ undo ; noun : ↑ deed ≠ ↑ misdeed , ↑ do , ↑ doing ; adjective : ↑ done , ↑ overdone , ↑ undone ]
1 . not fastened:
Your zip’s undone.
One of these buttons has come undone.
2 . not finished:
The washing-up had been left undone.
3 . old use destroyed and without hope:
In the end, Othello is undone by his jealousy.