Which to use
“undeniable” is an adjective and “undeniably” is an adverb - they look or sound alike but fill different roles in a sentence.
- #18,726
- “undeniable” frequency rank
- #23,714
- “undeniably” frequency rank
- 42440
- confusion score
Side-by-Side Comparison
| Feature | undeniable | undeniably |
|---|---|---|
| Definition | Irrefutable, or impossible to deny. | In an undeniable manner, or to an undeniable extent. |
Letter map: undeniable vs undeniably
Shared letters muted; letters that set undeniable and undeniably apart highlighted. Shared run: 9. undeniable and undeniably follow the identical consonant-vowel pattern (VCCVCVVCCV). Same shape at a glance is often the real trap, independent of shared letters.
Part-of-speech tell for undeniable / undeniably
Our dataset has no pronunciation recorded for both members, so the reliable separator here is grammatical: undeniable is anadjective and undeniablyanadverb. On the page they differ by a single letter - e in “undeniable” becomes y in “undeniably”. Our composite confusion score for this pair is 42440, derived from the frequency rank of both members and their visual similarity.
undeniable is recorded at frequency rank #18,726, classified as anadj, pronounced /ˌʌn.dɪˈnaɪ.(j)ə.bəɫ/. undeniably is at rank #23,714, tagged as anadv.
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 42440, this pair ranks #249,198 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of undeniable vs undeniably
Shared letters: abdeilnu. Private to "undeniable": -. Private to "undeniably": y.
"undeniable" · 10 letters · shape VCCVCVVCCV · "undeniably" · 10 letters · shape VCCVCVVCCV
Known mistypes of this pair
- undeniable ← nudeniable · udneniable · unddeniable · undeinable · undenaible · undeniabble · undeniabel · undeniablle
- undeniably ← nudeniably · udneniably · unddeniably · undeinably · undenaibly · undeniabbly · undeniablly · undeniablyy
Frequently Asked Questions
Do "undeniable" and "undeniably" mean the same thing in a sentence?
Which is more common, "undeniable" or "undeniably"?
Useful next steps
Done with this confusable. These links stay specific to "undeniable" and "undeniably".
- Full dictionary entry for "undeniable" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "undeniably" - compare definitions side by side with the headword page. Word entry
- This pair ranks #249,198 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "undeniable" and "undeniably" also get mixed up with nearby pairs, the highest-scored neighbour is "undeniable vs untenable". 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 #249,198 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.