Which to use
“improper” is an adjective and “improve” is a verb - they look or sound alike but fill different roles in a sentence.
- #13,366
- “improper” frequency rank
- #1,696
- “improve” frequency rank
- 15062
- confusion score
Side-by-Side Comparison
| Feature | improper | improve |
|---|---|---|
| Definition | Unsuitable to needs or circumstances; inappropriate; inapt. | To make (something) better; to increase the value or productivity (of something). |
Where the eye mixes improper and improve
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence.
Why the eye confuses improper with improve
These two trip readers on the page rather than in the ear: improper is /ɪmˈpɹɒp.ə/ while improve is /ɪmˈpɹuːv/. 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 verb), which is usually the fastest check. Our composite confusion score for this pair is 15062, derived from the frequency rank of both members and their visual similarity.
improper is recorded at frequency rank #13,366, classified as anadj, pronounced /ɪmˈpɹɒp.ə/. improve is at rank #1,696, tagged as averb, pronounced /ɪmˈpɹuːv/.
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 15062, this pair ranks #466,290 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of improper vs improve
Shared letters: eimopr. Private to "improper": -. Private to "improve": v.
"improper" · 8 letters · shape VCCCVCVC · "improve" · 7 letters · shape VCCCVCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "improper" for "improve" ever safe?
In ordinary English text, does "improper" or "improve" show up more?
After this comparison
Eye-level mix-up between "improper" and "improve" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "improper" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "improve" - compare definitions side by side with the headword page. Word entry
- This pair ranks #466,290 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "improper" and "improve" also get mixed up with nearby pairs, the highest-scored neighbour is "implode vs improve". 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 #466,290 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.