Synonym: done for, ruined, sunk, unstuck, washed-up. Similar words: hand on, off and on, abandon, condone, abandoned, depend on, abandonment, undo. Meaning: [‚ʌn'duː] 
adj. 1. not done 2. doomed to extinction 3. not fastened or tied or secured 4. thrown into a state of disorganization or incoherence.
adj. 1. not done 2. doomed to extinction 3. not fastened or tied or secured 4. thrown into a state of disorganization or incoherence. 1 Things done cannot be undone.
2 What's done can't be undone.
3 What is done cannot be undone. 
4 Overdone is worse than undone.
5 Take honour from me and my life is undone.
6 One of these buttons has come undone .
7 My button's come undone again.
8 The top button of his shirt was undone.
9 Hey Chris, your fly's undone!
10 what's done cannot be undone.
11 The screws can be undone by hand.
12 His tie was undone.
13 His pack was undone.
14 My shoelaces came undone.
15 The evil that he did can never be undone.
16 In the end[sentencedict.com/undone.html], Othello is undone by his jealousy.
17 The stitching along my coat hem is coming undone.
18 His shoelace had come undone.
19 I left my work undone.
20 The washing-up had been left undone .
21 My shoe laces keep coming undone.
22 Your zip's undone at the back.
23 Damn, my shoe-laces have come undone again.
24 John, your flies are/fly is undone!
25 Do you know your flies are undone?
26 He left nothing undone that needed attention.
27 In the election of a wife, as in a project of war, to err but once is to be undone for ever.
28 I hate to see things done by halves-- If it be right, do it boldly, --if it be wrong, leave it undone.
29 The sticky tape on the parcel came unstuck and the whole thing came undone.
30 She was repairing Billy's trousers, where the seam had come undone.
More similar words: hand on, off and on, abandon, condone, abandoned, depend on, abandonment, undo, run down, sound off, undoing, round off, undoubtedly, underground, round and round, done, donor, hold on, outdone, done in, done for, pardon, donate, cordon, head on, feed on, based on, hold on to, don't care, sardonic.