Which to use
“prompt” is an adjective and “promptly” is an adverb - they look or sound alike but fill different roles in a sentence.
- #8,845
- “prompt” frequency rank
- #9,083
- “promptly” frequency rank
- 17928
- confusion score
Side-by-Side Comparison
| Feature | prompt | promptly |
|---|---|---|
| Definition | Quick; acting without delay. | In a prompt manner. |
Where the eye mixes prompt and promptly
Muted = shared; highlighted = the visual trap. They share 6 letters in sequence. prompt runs 6 letters (CCVCCC) against promptly's 8 (CCVCCCCV) - the length gap alone is often enough to separate them once you know to check it.
Why the eye confuses prompt with promptly
These two trip readers on the page rather than in the ear: prompt is /pɹɒmpt/ while promptly is /ˈpɹɑmptli/. Spoken aloud the problem disappears. In writing it persists, because they differ by 2 extra letter(s) - “prompt” sits inside “promptly”, and the parts of speech differ too (adjective vs adverb), which is usually the fastest check. Our composite confusion score for this pair is 17928, derived from the frequency rank of both members and their visual similarity.
prompt is recorded at frequency rank #8,845, classified as anadj, pronounced /pɹɒmpt/. promptly is at rank #9,083, tagged as anadv, pronounced /ˈpɹɑmptli/.
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 17928, this pair ranks #448,266 of 530,003 scored English confusable pairs - a relatively easy-to-tell-apart pair.
Orthographic DNA of prompt vs promptly
Shared letters: moprt. Private to "prompt": -. Private to "promptly": ly.
"prompt" · 6 letters · shape CCVCCC · "promptly" · 8 letters · shape CCVCCCCV
Known mistypes of this pair
Frequently Asked Questions
Can "prompt" and "promptly" be used interchangeably?
In ordinary English text, does "prompt" or "promptly" show up more?
Useful next steps
Eye-level mix-up between "prompt" and "promptly" is sorted above. Next: full entries or other pairs that share a letter shape.
- Full dictionary entry for "prompt" with definition, IPA, and generated misspellings. Word entry
- Full dictionary entry for "promptly" - compare definitions side by side with the headword page. Word entry
- This pair ranks #448,266 of 530,003 scored English confusable pairs in this corpus vintage. Corpus statistics
- "prompt" and "promptly" also get mixed up with nearby pairs, the highest-scored neighbour is "prompt vs Prot". 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 #448,266 of 530,003 scored English pairs, corpus vintage 2026-09-03, not spelling advice.