Which to use
“undue” is an adjective and “unduly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #20,003
- “undue” frequency rank
- #29,875
- “unduly” frequency rank
- 49878
- confusion score
Side-by-Side Comparison
| Feature | undue | unduly |
|---|---|---|
| Definition | Excessive; going beyond that what is natural or sufficient. | Undeservedly; in a way that is not warranted. |
Where the spellings diverge
Shared letters are muted; the letters that actually set undue and unduly apart are highlighted. They share 4 letters in sequence, which is exactly why the eye skips the difference.
Spelling & Dictionary Insight
These two trip readers on the page rather than in the ear: undue is /ʌnˈdjuː/ while unduly is /ʌnˈdjuːli/. 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 (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 49878, derived from the frequency rank of both members and their visual similarity.
undue is recorded at frequency rank #20,003, classified as anadj, pronounced /ʌnˈdjuː/. unduly is at rank #29,875, tagged as anadv, pronounced /ʌnˈdjuːli/.
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 49878, this pair ranks #179,446 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of undue vs unduly
Shared letters: dnu. Private to "undue": e. Private to "unduly": ly.
"undue" · 5 letters · shape VCCVV · "unduly" · 6 letters · shape VCCVCV
Known mistypes of this pair
Frequency comparison
Frequently Asked Questions
Can "undue" and "unduly" be used interchangeably?
Which is more common, "undue" or "unduly"?
Remembering undue vs unduly
The fastest way to pick the right one every time.
- Check the role first: if you need an adjective, it's “undue”; for an adverb, it's “unduly”.
- See each word in full, definition, IPA, etymology and its other confusables. Full “undue” entry
- Browse more pairs most likely to be confused. Most confusable