undone

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what is done cannot be undone

You cannot reverse, change, or take back that which has already happened. This is a delicate situation, so you can't act impulsively. Keep in mind that what is done cannot be undone.
See also: cannot, done, undone, what

what's done cannot be undone

You cannot change what has already happened or come to pass, so there's no use worrying or stressing about it; what's done is done. I know this isn't the outcome we wanted, but what's done cannot be undone, so let's just try to make the most of a bad situation. I'm really disappointed in what you did, but what's done cannot be undone—let's just forget about it now.
See also: cannot, done, undone
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

What's done cannot be undone.

Prov. You cannot change what has already happened. Jill: I wish I hadn't insulted Maria. Jane: What's done cannot be undone. Jill soon regretted telling Mike that she loved him, but she knew that what's done cannot be undone.
See also: cannot, done, undone
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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