Which to use
“sei” is a verb and “sly” is an adjective - they look or sound alike but fill different roles in a sentence.
- #36,154
- “sei” frequency rank
- #47,613
- “sly” frequency rank
- 83767
- confusion score
Side-by-Side Comparison
| Feature | sei | sly |
|---|---|---|
| Definition | Deuxième personne du singulier de l’impératif présent de sein. | Matois, malin. |
Where the eye mixes sei and sly
Muted = shared; highlighted = the visual trap. They share 1 letter in sequence. sei (CVV) and sly (CCV) run the same length but a different consonant-vowel pattern - the shape difference is usually the fastest tell.
Why the eye confuses sei with sly
These two trip readers on the page rather than in the ear: sei is \zaɪ̯\ while sly is \ˈslaɪ\. Spoken aloud the problem disappears. In writing it persists, because they share most of their letters but differ in 2 positions, and the parts of speech differ too (verb vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 83767, derived from the frequency rank of both members and their visual similarity.
sei is recorded at frequency rank #36,154, classified as averb, pronounced \zaɪ̯\. sly is at rank #47,613, tagged as anadj, pronounced \ˈslaɪ\.
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 83767, this pair ranks #14,201 of 440,172 scored French confusable pairs - among the most confusable pairs.
Orthographic DNA of sei vs sly
Shared letters: s. Private to "sei": ei. Private to "sly": ly.
"sei" · 3 letters · shape CVV · "sly" · 3 letters · shape CCV
Frequently Asked Questions
Do "sei" and "sly" mean the same thing in a sentence?
Frequency check: "sei" vs "sly" - which ranks higher?
After this comparison
Eye-level mix-up between "sei" and "sly" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "sei" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "sly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #14,201 of 440,172 scored French confusable pairs in this corpus vintage. Corpus statistics
- "sei" and "sly" also get mixed up with nearby pairs, the highest-scored neighbour is "sly vs suu". Nearby pair
Confusion rank #14,201 of 440,172 scored French pairs, corpus vintage 2026-09-03, not spelling advice.