Which to use
“surety” is a noun and “surly” is an adjective - they look or sound alike but fill different roles in a sentence.
- #36,360
- “surety” frequency rank
- #35,102
- “surly” frequency rank
- 71462
- confusion score
Side-by-Side Comparison
| Feature | surety | surly |
|---|---|---|
| Definition | Certainty. | Irritated, bad-tempered, unfriendly. |
Where the eye mixes surety and surly
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence. surety runs 6 letters (CVCVCV) against surly's 5 (CVCCV) - the length gap alone is often enough to separate them once you know to check it.
Visual trap between surety and surly
These two trip readers on the page rather than in the ear: surety is /ˈʃɔːɹɪti/ while surly is /ˈsɜːli/. 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 (noun vs adjective), which is usually the fastest check. Our composite confusion score for this pair is 71462, derived from the frequency rank of both members and their visual similarity.
surety is recorded at frequency rank #36,360, classified as anoun, pronounced /ˈʃɔːɹɪti/. surly is at rank #35,102, tagged as anadj, pronounced /ˈsɜːli/.
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 71462, this pair ranks #46,611 of 530,003 scored English confusable pairs - among the most confusable pairs.
Orthographic DNA of surety vs surly
Shared letters: rsuy. Private to "surety": et. Private to "surly": l.
"surety" · 6 letters · shape CVCVCV · "surly" · 5 letters · shape CVCCV
Known mistypes of this pair
Frequently Asked Questions
Is swapping "surety" for "surly" ever safe?
In ordinary English text, does "surety" or "surly" show up more?
Useful next steps
Eye-level mix-up between "surety" and "surly" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "surety" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "surly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #46,611 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "surety" and "surly" also get mixed up with nearby pairs, the highest-scored neighbour is "sura vs surly". 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 #46,611 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.