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Definitions

undo

[uhn-doo] / ʌnˈdu /
VERB
open
Synonyms
STRONGEST
loosen unlock unravel
STRONG
disengage disentangle free loose release unbind unblock unbutton unfasten unloose unloosen untie unwrap
WEAK
unclose unfix unshut unstop
Antonyms
STRONG
button fasten
WEAK
close do up
VERB
nullify, invalidate
Synonyms
STRONGEST
abolish annul destroy mar negate offset overturn quash reverse ruin shatter spoil subvert undermine wipe out wreck
STRONG
abate abrogate annihilate break cancel cramp craze crimp decimate defeat demolish have impoverish injure neutralize outfox outmaneuver outsmart overreach overthrow raze skin smash stymie unsettle upset vitiate wrack
WEAK
bring down bring to naught make waves screw up unbuild
Antonyms
STRONGEST
aid allow assist build construct create grow help permit repair restore support uphold
STRONG
approve balance encourage establish fix mend revive save
WEAK
validate

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The California Faculty Association said the verdict, while welcome, could not undo the harm Caravello endured, adding that its members would continue working to protect immigrant communities.

From Los Angeles Times • Apr. 10, 2026

The war’s end threatens to undo all that.

From Barron's • Apr. 9, 2026

"No sentence can undo the trauma of what she endured. But we hope today marks the beginning of her journey toward the bright, safe, and happy future she deserves," the judge told the court.

From BBC • Mar. 27, 2026

The company said the military’s latest proposal would effectively undo those guardrails.

From The Wall Street Journal • Feb. 26, 2026

“Well,” said Burke, “what you got to do is undo the curse, right? That’s what I would do.”

From "Louisiana's Way Home" by Kate DiCamillo

Vocabulary lists containing undo

Commonly Confused Words, List 3

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Commonly Confused Words, List 5

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Commonly Confused Words, List 7

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