Which to use
“undo” is a verb and “undue” is an adjective - they look or sound alike but fill different roles in a sentence.
- #13,631
- “undo” frequency rank
- #20,003
- “undue” frequency rank
- 33634
- confusion score
Side-by-Side Comparison
| Feature | undo | undue |
|---|---|---|
| Definition | To reverse the effects of an action. | Excessive; going beyond that what is natural or sufficient. |
Where the eye mixes undo and undue
Muted = shared; highlighted = the visual trap. They share 3 letters in sequence.
Look-alike desk: undo vs undue
These two trip readers on the page rather than in the ear: undo is /ʌnˈduː/ while undue is /ʌnˈdjuː/. Spoken aloud the problem disappears. In writing it persists, because they differ by 1 letter(s) in length, and the parts of speech differ too (verb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 33634, derived from the frequency rank of both members and their visual similarity.
undo is recorded at frequency rank #13,631, classified as averb, pronounced /ʌnˈduː/. undue is at rank #20,003, tagged as anadj, pronounced /ʌnˈdjuː/.
Glosses for this pair are partially populated in our dataset, but the full side-by-side definitions above should still guide you to the right choice.
With a confusion score of 33634, this pair ranks #327,733 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of undo vs undue
Shared letters: dnu. Private to "undo": o. Private to "undue": e.
"undo" · 4 letters · shape VCCV · "undue" · 5 letters · shape VCCVV
Known mistypes of this pair
Frequently Asked Questions
Do "undo" and "undue" mean the same thing in a sentence?
Which is more common, "undo" or "undue"?
What to do next
Eye-level mix-up between "undo" and "undue" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "undo" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "undue" - compare definitions side by side with the headword page. Word entry
- This pair ranks #327,733 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "undo" and "undue" also get mixed up with nearby pairs, the highest-scored neighbour is "undue vs unsee". Nearby pair
- Recorded mistypes exist for at least one side of this pair, useful when a spell-checker or OCR lands on the wrong form. See mistypes
Confusion rank #327,733 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.