A simple click on 'undo' revealed her last change.He wished he could undo the damage in the relationship.An 'undo' button on life would be a blessing of sorts.
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Antonyms:
Undue
/ˌʌnˈdjuː/
Not appropriate or excessive in relation to what is needed
Examples:
The judge ruled there was undue influence in the decision.His promotion was met with undue praise from the media.I worry about the undue stress the project might cause her.
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Ways to tell them apart:
Undo is an action, often associated with reversing something that was done, like going back a step in a process.
Undue is about something being inappropriate or excessive, more than necessary.
Think of undo as in undoin the knots, where you want to reverse a tying process.
Undue can be remember because it often precedes words like stress or influence indicating excessiveness.
Undo comes from do, indicating an action, while undue ends in due, relating to what is deserved or fitting.