Which to use
“deep” is an adjective and “deeply” is an adverb - they look or sound alike but fill different roles in a sentence.
- #945
- “deep” frequency rank
- #3,358
- “deeply” frequency rank
- 4303
- confusion score
Side-by-Side Comparison
| Feature | deep | deeply |
|---|---|---|
| Definition | Extending, reaching or positioned far from a point of reference, especially downwards. | To a deep extent or degree; very greatly. |
Where the eye mixes deep and deeply
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Why the eye confuses deep with deeply
These two trip readers on the page rather than in the ear: deep is /diːp/ while deeply is /ˈdi(ː)pli/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “deep” sits inside “deeply”, and the parts of speech differ too (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 4303, derived from the frequency rank of both members and their visual similarity.
deep is recorded at frequency rank #945, classified as anadj, pronounced /diːp/. deeply is at rank #3,358, tagged as anadv, pronounced /ˈdi(ː)pli/.
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 4303, this pair ranks #519,366 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of deep vs deeply
Shared letters: dep. Private to "deep": -. Private to "deeply": ly.
"deep" · 4 letters · shape CVVC · "deeply" · 6 letters · shape CVVCCV
Known mistypes of this pair
Frequently Asked Questions
Can "deep" and "deeply" be used interchangeably?
In ordinary English text, does "deep" or "deeply" show up more?
What to do next
Eye-level mix-up between "deep" and "deeply" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "deep" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "deeply" - compare definitions side by side with the headword page. Word entry
- This pair ranks #519,366 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "deep" and "deeply" also get mixed up with nearby pairs, the highest-scored neighbour is "deep vs DNP". 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 #519,366 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.