Which to use
“imperious” and “impervious” are a confusable English pair: similar on the page, but distinct in meaning, check the gloss before you choose.
- #43,703
- “imperious” frequency rank
- #33,680
- “impervious” frequency rank
- 77383
- confusion score
Side-by-Side Comparison
| Feature | imperious | impervious |
|---|---|---|
| Definition | Domineering, arrogant, or overbearing. | Unaffected or unable to be affected by something. |
Where the eye mixes imperious and impervious
Muted = shared; highlighted = the visual trap. They share 9 letters in sequence.
Why the eye confuses imperious with impervious
A purely visual mix-up. imperious (/ɪmˈpɪə̯.ɹi.əs/) and impervious (/ɪmˈpɜːvi.əs/) are said differently, so reading them aloud is the quickest way to catch the wrong one. On the page they stay close: they differ by 1 letter(s) in length. Our composite confusion score for this pair is 77383, derived from the frequency rank of both members and their visual similarity.
imperious is recorded at frequency rank #43,703, classified as anadj, pronounced /ɪmˈpɪə̯.ɹi.əs/. impervious is at rank #33,680, tagged as anadj, pronounced /ɪmˈpɜːvi.əs/.
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 77383, this pair ranks #27,439 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of imperious vs impervious
Shared letters: eimoprsu. Private to "imperious": -. Private to "impervious": v.
"imperious" · 9 letters · shape VCCVCVVVC · "impervious" · 10 letters · shape VCCVCCVVVC
Known mistypes of this pair
- imperious ← imeprious · immperious · impeirous · imperiosu · imperiouss · imperiuos · imperoius · imperrious
- impervious ← imeprvious · immpervious · imperivous · imperrvious · imperviosu · imperviouss · imperviuos · impervoius
Frequently Asked Questions
Can "imperious" and "impervious" be used interchangeably?
Frequency check: "imperious" vs "impervious" - which ranks higher?
After this comparison
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "imperious" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "impervious" - compare definitions side by side with the headword page. Word entry
- This pair ranks #27,439 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "imperious" and "impervious" also get mixed up with nearby pairs, the highest-scored neighbour is "imperious vs impetuous". 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 #27,439 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.