Which to use
“deadly” is an adjective and “deftly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #5,489
- “deadly” frequency rank
- #34,853
- “deftly” frequency rank
- 40342
- confusion score
Side-by-Side Comparison
| Feature | deadly | deftly |
|---|---|---|
| Definition | Subject to death; mortal. | In a deft manner; quickly and neatly in action. |
Where the eye mixes deadly and deftly
Muted = shared; highlighted = the visual trap. They share 4 letters in sequence.
Look-alike desk: deadly vs deftly
These two trip readers on the page rather than in the ear: deadly is /ˈdɛdli/ while deftly is /ˈdɛftli/. 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 (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 40342, derived from the frequency rank of both members and their visual similarity.
deadly is recorded at frequency rank #5,489, classified as anadj, pronounced /ˈdɛdli/. deftly is at rank #34,853, tagged as anadv, pronounced /ˈdɛftli/.
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 40342, this pair ranks #268,477 of 530,003 scored English confusable pairs - roughly mid-pack for confusability.
Orthographic DNA of deadly vs deftly
Shared letters: dely. Private to "deadly": a. Private to "deftly": ft.
"deadly" · 6 letters · shape CVVCCV · "deftly" · 6 letters · shape CVCCCV
Known mistypes of this pair
Frequently Asked Questions
Can "deadly" and "deftly" be used interchangeably?
Which is more common, "deadly" or "deftly"?
Useful next steps
Pronunciation already separates them, if the page still looks alike, the dictionary links below settle it.
- Full dictionary entry for "deadly" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "deftly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #268,477 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "deadly" and "deftly" also get mixed up with nearby pairs, the highest-scored neighbour is "defile vs deftly". 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 #268,477 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.