Which to use
“sound” is an adjective and “soundly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #742
- “sound” frequency rank
- #30,238
- “soundly” frequency rank
- 30980
- confusion score
Side-by-Side Comparison
| Feature | sound | soundly |
|---|---|---|
| Definition | Healthy. | In a thorough manner; in manner free of defect or deficiency. |
Where the eye mixes sound and soundly
Muted = shared; highlighted = the visual trap. They share 5 letters in sequence. sound runs 5 letters (CVVCC) against soundly's 7 (CVVCCCV) - the length gap alone is often enough to separate them once you know to check it.
Look-alike desk: sound vs soundly
These two trip readers on the page rather than in the ear: sound is /saʊnd/ while soundly is /ˈsaʊnd.lɪ/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “sound” sits inside “soundly”, and the parts of speech differ too (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 30980, derived from the frequency rank of both members and their visual similarity.
sound is recorded at frequency rank #742, classified as anadj, pronounced /saʊnd/. soundly is at rank #30,238, tagged as anadv, pronounced /ˈsaʊnd.lɪ/.
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 30980, this pair ranks #350,072 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of sound vs soundly
Shared letters: dnosu. Private to "sound": -. Private to "soundly": ly.
"sound" · 5 letters · shape CVVCC · "soundly" · 7 letters · shape CVVCCCV
Known mistypes of this pair
Frequently Asked Questions
Can "sound" and "soundly" be used interchangeably?
Which is more common, "sound" or "soundly"?
After this comparison
Visual near-miss handled. Browse the word pages or a neighbour when the next look-alike shows up.
- Full dictionary entry for "sound" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "soundly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #350,072 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "sound" and "soundly" also get mixed up with nearby pairs, the highest-scored neighbour is "soundly vs sundry". 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 #350,072 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.